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665 providers
Availability last updated 05/13/2026
Biography:
• College: Bachelor of Science (St. Cloud State University-St. Cloud, Minnesota)
• Physician Assistant Program: Master of Physician Assistant Studies (Northern Arizona University-Flagstaff, AZ)
• Board Certification: Certified Physician Assistant
• Language: English
Karlee grew up in a small town in Southern Wisconsin and went on to attend St. Cloud State University in Minnesota, where she played NCAA college soccer. After earning a degree in biomedical science with magna cum laude honors, she pursued her passion for medicine by obtaining a Physician Assistant degree from Northern Arizona University. During her time at Northern Arizona University she was an Arizona Area Health Education Center Scholar, engaging in a comprehensive two year interprofessional program that focused on preparing healthcare professionals for practice in underserved communities. This experience combined hands-on clinical training with community based learning, fostering a deep understanding of diverse patient needs.
Outside of work she enjoys reading, running, yoga, and spending quality time with family. Her commitment to ongoing learning and staying current with the latest medical advancements ensures that she is always equipped to deliver high quality care to her patients.
Karlee Krebs
Physician Assistant
20745 N. Scottsdale Rd.
115
Scottsdale, AZ 85255
Dr. Andrew J. Buresh specializes in medical oncology, hematology, and internal medicine. He is interested in all aspects of clinical oncology and hematology, with a particular interest in gastrointestinal, breast, lung, and prostate cancer, as well as myelodysplasia, coagulation disorders, lymphoma, and myeloma.
Dr. Buresh joined Arizona Center for Cancer Care in 2013 when Desert Springs Cancer Care Center, which he founded and partnered with the practice. He is a member of the American Society of Clinical Oncology, American Society of Hematology and Arizona State Physicians Association.
Dr. Buresh is a multi-year “Top Doc” honoree by Phoenix Magazine and was chosen for the cover of the annual ranking magazine in 2013. He was also honored by the Phoenix Business Journal as among its “40 Top Business Leaders under Age 40.”
Dr. Buresh and his wife are blessed to be the proud parents of three beautiful children. When not caring for patients, Dr. Buresh enjoys spending his time with family, exercising, reading, playing basketball, golf, guitar, and coaching youth sports. He also speaks basic medical Spanish.
Patient Reviews:
"Warm and caring in all aspects of care. He’s special in his approach and looks at the big picture. Spends a lot of time asking questions and is conservative in his approach. So glad I was referred to him and will continue to refer him to others. Don’t be afraid~ take him on your journey with you!" -Robin
"Excellent Hematologist/Oncologist!!!" -Medi
Dr. Andrew Buresh, MD
Internist
20745 N. Scottsdale Rd.
115
Scottsdale, AZ 85255
BIOGRAPHY
Dr. Nagaiah received his medical degree from MGR Medical University in India and has been in practice for more than 20 years. His residency and internship were completed at Mercy Catholic Medical Center in Pennsylvania, and he completed a fellowship at West Virginia University. He earned a Masters in Clinical Research from the MGH Institute of Health Professions in Boston. Dr. Nagaiah has expertise in treating lymphoma, lung cancer, and breast cancer, among other conditions.
PHILOSOPHY
I believe that being an oncologist is a privilege that is not to be taken lightly. I strive to provide evidence-based care that is appropriate to my patients’ particular problem, recognizing and respecting individual patient’s wishes. I take a multidisciplinary approach to care, including alternative therapies that have been shown to be effective.
RESEARCH PUBLICATIONS
LinkedIn:
Dr. Govardhanan Nagaiah, MD
Internist
20745 N. Scottsdale Rd.
115
Scottsdale, AZ 85255
Craig Hullett, MD, PhD, is a board-certified radiation oncologist with extensive experience in the treatment of a wide range of malignancies. He began his academic career in Communication, earning a Bachelor of Arts from Augustana College in Rock Island, Illinois, followed by a Master of Arts from Wake Forest University and a Doctor of Philosophy from Michigan State University. He later served as a tenured Associate Professor of Communication at the University of Arizona.
Inspired by his volunteer work at a local hospice, Dr. Hullett transitioned to medicine and earned his Doctor of Medicine degree from the University of Arizona. During medical school, he was inducted into the Gold Humanism Honor Society and Alpha Omega Alpha, recognizing his commitment to compassionate, patient-centered care and academic excellence. He completed his internship and residency training in Radiation Oncology at the University of Wisconsin.
Dr. Hullett has been practicing in Arizona since 2022 and is pleased to have returned to the state with his family. Outside of his clinical practice, he enjoys spending time with his family, exercising, and traveling.
Languages spoken: English
Dr. Craig Hullett, MD
Radiologist
20745 N. Scottsdale Rd.
115
Scottsdale, AZ 85255
Gregory A. Maggass, MD is board certified in radiation oncology, with a focus on the treatment of prostate cancer with both brachytherapy and IMRT/IGRT radiation therapy. Dr. Maggass has extensive experience with brachytherapy treatment using radioactive seeds, otherwise known as Internal Radiation Therapy. He is a pioneer in bringing Brachytherapy to patients in Arizona treating prostate, skin, eye and breast cancers. Dr. Maggass also specializes in PLUVICTO for prostate cancer treatment and LUTATHERA for neuroendocrine cancer treatment.
Passionate about advancing treatments in cancer care, Dr. Maggass played an instrumental role in developing improved treatments for delivering radiation, as well as combining radiation with surgical techniques and chemotherapy.
For nearly two decades, Dr. Maggass served as the Medical Director for Arizona Oncology Services in the East Valley. In this role, he started and lead the prostate brachytherapy program at Banner Desert Medical Center and Banner Baywood. In 2012, Dr. Maggass partnered with Arizona Center for Cancer Care to expand the groups footprint into the East Valley.
Dr. Maggass received his Medical Degree from the Medical College of Wisconsin. He completed his residency at the University of Southern California Medical Center, where he received specialized training in Brachytherapy.
Dr. Maggass is a multi-year “Top Doc” honoree by Phoenix Magazine, and “Best Doctors in America” honoree by Best Doctors, Inc.
Patient Reviews:
"I needed a calm, straight forward explanation of my situation to make a choice in treatment. Dr. Maggass took his time and was genuinely engaged when he talked to my wife and I and he even let me talk once more on the phone when I had more questions. I would recommend him." -Wade
"Dr Maggass has been fantastic! Excellent bedside manner, and has always been forthright me. We are early on in this journey, but feel I am in good hands with both doctor, and his wonderful staff." -Jeff
Dr. Gregory Maggass, MD
Radiologist
20940 N Tatum Blvd
Suite 125
Phoenix, AZ 85050
Specializing in treating benign and malignant breast disease, Dr. Cox has a special interest in breast conservation and minimally-invasive techniques. With this emphasis, she helps each patient choose the best surgical and oncologic results while preserving as much normal breast tissue as possible.
After completing undergraduate and graduate degrees at California State University, Dr. Cox graduated from Flinders University of South Australia. She completed her general surgery training at Pennsylvania State University's Milton S. Hershey Medical Center and a Breast Surgical Oncology fellowship at The Cancer Institute of New Jersey/UMDNJ-Robert Wood Johnson Hospital.
In her spare time, Dr. Cox enjoys Bikram yoga and hiking in the Arizona foothills with her two shiba inus. She travels and, in particular, enjoys the beautiful cultures and histories of the Asian continent.
Patient Reviews:
"Dr. Cox is a fantastic Dr./surgeon. I went to her after receiving positive cancer biopsy results. That in and of itself is super scary, let alone not knowing what was going to happen next. This wonderful, warm Dr. sat next to me and explained everything so I could understand it. Dr Cox took her time with me, she drew pictures to show me everything that was going on and what she was going to do. Dr. Cox tells you how it is in the most compassionate way. I felt very cared for. I had a lumpectomy with sentinel node biopsy. She did a beautiful job surgically. The follow up phone calls were made in a timely manner. Her staff is wonderful as well. I highly recommend Dr. Cox and going forward should I do mastectomy she will be my surgeon hands down!" -Deborah
"I took my wife to our 1st consultation. The experience was very informative. Dr Cox spent the time to go through all our options. She was so personable and kind I left her office with my wife feeling we have made the best choice in the valley. Looking forward to our journey with her on our team. I highly recommend her." -Pete
Dr. Kimberli Cox, MD
Surgeon
20940 N Tatum Blvd
Suite 125
Phoenix, AZ 85050
Dr. Christopher Biggs specializes in radiation oncology and is an expert in radiosurgery and gynecological oncology.
Dr. Biggs co-founded Arizona Center for Cancer Care in 2008 with Drs. Devinder Singh, Daniel Reed and Terry Lee. He attended the University of Arizona, where he received his Bachelor of Science degree in Molecular and Cellular biology. His interest in cancer research took him to the University of Southern California, under the Borchard Cancer Research Fellowship. There, he performed research on the molecular genetics of cancer at the Norris Cancer Center and at LA Children’s Hospital. After completing his Doctor of Philosophy degree, he moved to Stanford University, where he earned his medical degree, and developed an interest in radiation oncology. Dr. Biggs completed his residency in radiation oncology at the University of California, San Francisco, where he eventually served as chief resident.
For five years, Dr. Biggs performed radiosurgery at Barrow Neurological Institute and also served as director of the Baptist Oncology Center.
Dr. Biggs is certified by the American Board of Radiology and is a Diplomat of the American Society of Therapeutic Radiation Oncology. He is a member of the American Association for Cancer Research, Radiology Society of North America, American Society of Therapeutic Radiation Oncology and the American Association of Advancement of Science.
Dr. Biggs is a multi-year “Top Doc” honoree by Phoenix Magazine.
Patient Reviews:
"My experience was great I even had to travel from Yuma AZ for my treatments. DR Biggs made everything go as easy and painless for me. his staff were extremely kind and professional just like him! I appreciate so much for their empathy they had for me and my battle with cancer. Thank you from the bottom of my heart. I highly recommend this office." -Jen
"The office visit was for my husband Jessie Wilson. Dr. Biggs is excellent at relieving any anxiety we had going in. He took the time to explain everything as well as talking about personal info to get to know us better. We left feeling very relaxed and confident in his care moving forward. We highly recommend Dr. Biggs and his entire staff to anyone who needs treatment!" -Linda
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Dr. Christopher Biggs, MD
Radiologist
20940 N Tatum Blvd
Suite 125
Phoenix, AZ 85050
Janice is a dedicated hematology/oncology nurse practitioner who collaborates closely with physicians and other healthcare team members to deliver comprehensive care, offering unwavering support to patients and caregivers during treatment and beyond. With over 12 years of experience as a hematology, oncology, and bone marrow transplant nurse, Janice has worked with medically complex neonates, pediatrics, and adults in both inpatient and outpatient settings. She earned both a bachelor's and a master's degree from the University of Phoenix and is nationally certified as a Nurse Practitioner by the American Association of Nurse Practitioners. Passionate about patient advocacy and education, Janice seeks to empower patients by listening to their health needs and goals and working in partnership with them and their families to manage their health effectively.
Janice Gallegos, FNP
Nurse Practitioner
20940 N Tatum Blvd
Suite 125
Phoenix, AZ 85050
Dr. Daniel Richard Reed specializes in radiation oncology, with a focus on breast and prostate cancers.
Dr. Reed co-founded Arizona Center for Cancer Care in 2008 with Drs. Devinder Singh, Christopher Biggs and Terry Lee. He received his Bachelor of Science in Chemistry and Biology from Western Kentucky University. He attended medical school at West Virginia School of Osteopathic Medicine, completed his internship at Doctors Hospital Ohio University and his residency at the University of Washington Medical Center, where he would eventually serve as Chief Resident and in 2002 earned the National Research Award in radiation oncology for his work in breast cancer treatment. He also served as the Seattle Prostate Institute/American Brachytherapy Society Prostate fellowship coordinator for several years.
In 2007, he authored the National Treatment Guidelines of the American College of Radiology for Prostate Cancer Radiation Therapy and the book chapter on Skull-based tumors in The Textbook of Radiation Oncology (2nd edition). He has also served as a scientific reviewer for the International Journal of Radiation Oncology and national representative of the American Brachytherapy Society.
Dr. Reed is certified by the American Board of Radiology and is a Diplomat of the American Society of Therapeutic Radiation Oncology. He is a current or past member of the American Brachytherapy Society, American Radium Society, American Radiology Resident Association, American Society of Clinical Oncology, American Medical Association and American Osteopathic Association, among others.
Dr. Reed is a multi-year “Top Doc” honoree by Phoenix Magazine and has over 70 combined 5-star reviews from happy patients.
Patient Reviews:
Dr. Daniel Reed
Radiologist
20940 N Tatum Blvd
Suite 125
Phoenix, AZ 85050
Dr. Abhimanyu Ghose clinical interests include treating patients with all types of cancer, including lung, gastrointestinal, breast, genitourinary (bladder, prostate, renal), skin, myeloma, lymphomas, and other blood disorders. Dr. Ghose has more than 25 published peer reviewed articles in field of oncology and has presented at national and international conferences.
Dr. Ghose believes in treating his patients with the same level of respect and compassion he would offer to his family members. He is a strong advocate for his patients. His approach is individualized to each patient because each patient’s condition and situation in life is unique.
In his free time, Dr. Ghose enjoys spending time with his family, dining out, hiking, and traveling. He is also an avid tennis player.
Patient Reviews:
"I have been treating with Dr. Abhimanyu Ghose since my diagnosis in December of 2018. I was diagnosed with Stage IV, Non Small Cell Lung cancer. I began treatment March of 2019 with chemotherapy and Keytruda. After completing chemotherapy I have remained on Keytruda since the beginning. I have been in remission for over a year and my CT scans continue to confirm no evidence of disease. I trust Dr. Ghose and his team to continue to make the best treatment plans possible for me. I also believe Keytruda has been a life saver for me! I continue to have infusions every 3 weeks with little to no adverse reactions. I am grateful to have Dr. Ghose and the infusion nurses taking care of me." -Nancy
"Have had wonderful care by Dr. Ghose thru my cancer treatment and follow ups for last 4 years. He is attentive and caring and positive. Easy to understand his explanations and thorough. Office experiences always efficient." -Jeff
Dr. Abhimanyu Ghose, MD
Internist
20940 N Tatum Blvd
Suite 125
Phoenix, AZ 85050
After graduating from a premier medical school in India, Dr. Fernandes continued her training in Internal Medicine and obtained advanced training in the treatment of blood and cancer disorders in the United States. She was awarded an international prestigious scholarship from the European Society of Medical Oncology and spent time as a visiting fellow in Medical Oncology in Spain.
Her areas of expertise include breast cancers in addition to treating other cancer disorders such as colon cancer, lung cancer, melanoma/skin cancers and blood disorders such as anemias, iron deficiency disorders, abnormal blood counts. She serves as a section editor for Breast Cancer on hemonc.org, an internationally accessed online resource for cancer physicians. She has presented cancer research at national and international cancer meetings in the United States and Europe and volunteers with the American Society of Clinical Oncology for peer review activities.
Dr. Fernandes believes in providing compassionate, exceptional and cutting-edge care to her patients. She strives to provide the most personalized treatment plan for her patients while taking into consideration their unique needs. Having had family members who have also been stricken with cancer, she understands and empathizes with the needs of caring for a loved one with cancer.
Dr. Fernandes enjoys spending time with family, travel, running, and watercolor painting.
Dr. Hermina Fernandes, MBBS, FACP
Internist
20940 N Tatum Blvd
Suite 125
Phoenix, AZ 85050
Dr. Parmjeet Kumar Banghar specializes in hematology, medical oncology, and internal medicine. He joined Arizona Center for Cancer Care in 2008 when his team at Arizona Center for Hematology and Oncology partnered with the practice.
Currently, Dr. Banghar is a member of the American Society of Clinical Oncology and American Society of Hematology. He has participated in a research study involving cerebrovascular diseases and been published in several journals, including Leukemia Research and the Indian Journal of Medical Sciences. He has also presented on a number of topics, including sonographic evaluation of the spleen in sickle cell syndromes, lennox gastaut syndrome and sweet syndrome in a patient with acute myeloid leukemia.
Patient Reviews:
"This doctor is smart and knows cancer. The staff is the best. My nurses who give me shots are the best! Highly reccomend this office." -Lina
"I have been Dr. Banghar's patient since 2019 and just found out I could give him a review. Wish I had been told this before. He is an excellent provider. He has made me feel confident about my treatment which I think has/had a tremendous amount of impact on my care and the outcome. I would recommend him and the facility in a heart beat." -Felicia
Dr. Parmjeet Banghar, MD
Internist
20940 N Tatum Blvd
Suite 125
Phoenix, AZ 85050
Dr. Kaplan treats a wide variety of medical oncology, malignant hematology, and benign hematologic disease. She is especially interested in treating breast cancer and general oncology.
Dr. Kaplan enjoys cooking, reading, watching sports, traveling, and spending time with family and her 2 dogs named Penny.
"Dr. Kaplan was a major part of my father-in-love’s cancer treatment and was one of his biggest champions. Her bedside manner was incredibly personalized, kind, and intentional. He couldn’t say enough wonderful things about her. I highly recommend her!" -Leanne
Dr. Jori Kaplan, MD
Internist
20940 N Tatum Blvd
Suite 125
Phoenix, AZ 85050
Dr. DiPasquale is a specialized breast surgeon with expertise in treating both malignant and benign breast diseases. Her passion lies in advanced oncoplastic reconstructive surgery, where she combines oncological principles with plastic surgery techniques. She strives to ensure excellent oncological outcomes while also prioritizing cosmetic results and patient satisfaction.
Originally from the east coast of Canada, Dr. DiPasquale completed her medical training at Dalhousie University. Following this, she pursued her General Surgery Residency at the University of Alberta. During her residency, she also earned a Master of Science degree at the prestigious Harvard T.H. Chan School of Public Health, where her research was recognized with an award from the Canadian Federation of University Women.
To further refine her skills and broaden her expertise, Dr. DiPasquale completed a breast oncoplastic and reconstruction surgery fellowship at the renowned Paris Breast Center. She is proud to hold board certifications from both the Royal College of Physicians and Surgeons of Canada and the American Board of Surgery.
Dr. DiPasquale's contributions extend beyond her clinical practice. She has co-authored numerous research papers and actively presents her work at international conferences. Additionally, she serves as a peer reviewer for international journals.
Outside of her professional endeavors, Dr. DiPasquale cherishes quality time spent with her loved ones, including her family, friends, and her beloved Yorkie. After escaping the cold Canadian winters, she also enjoys spending time outdoors in the warm Arizona sun.
Ashley Dipasquale, MD
Surgeon
20940 N Tatum Blvd
Suite 125
Phoenix, AZ 85050
Craig Hullett, MD, PhD, is a board-certified radiation oncologist with extensive experience in the treatment of a wide range of malignancies. He began his academic career in Communication, earning a Bachelor of Arts from Augustana College in Rock Island, Illinois, followed by a Master of Arts from Wake Forest University and a Doctor of Philosophy from Michigan State University. He later served as a tenured Associate Professor of Communication at the University of Arizona.
Inspired by his volunteer work at a local hospice, Dr. Hullett transitioned to medicine and earned his Doctor of Medicine degree from the University of Arizona. During medical school, he was inducted into the Gold Humanism Honor Society and Alpha Omega Alpha, recognizing his commitment to compassionate, patient-centered care and academic excellence. He completed his internship and residency training in Radiation Oncology at the University of Wisconsin.
Dr. Hullett has been practicing in Arizona since 2022 and is pleased to have returned to the state with his family. Outside of his clinical practice, he enjoys spending time with his family, exercising, and traveling.
Languages spoken: English
Dr. Craig Hullett, MD
Radiologist
20940 N Tatum Blvd
Suite 125
Phoenix, AZ 85050
Dr. Robin Obenchain specializes in Hematology and Medical Oncology. She believes in a holistic approach to cancer care integrating both the art and science of medicine uniquely based on an individualized care of each patient and family.
Dr. Obenchain joined Arizona Center for Cancer Care in 2016 and has been practicing in the Phoenix area for the past ten years. She has been published in Oncology Publishing Group: Colorectal Cancer in the Elderly Patient: Assessment and Treatment. She has received multiple awards including Association of Pathology Chairs Honor Society, the Higgins Award for outstanding Senior Resident and Alpha Omega Alpha Honor Society.
Dr. Obenchain has been named Top Doctor twice in the Phoenix Business Journal and is currently a member of the American College of Hospice and Palliative Medicine.
Patient Reviews:
"These people are awesome. The doctor, her assistant, and the entire staff are wonderful people and they're a pleasure to deal with in what are sometimes not the most ideal conditions. They are extremely helpful, friendly courteous professional and I could go on and on. There is a single bad thing I can say about this practice or anyone who works here. Special shout outs to Dr Robin herself, Carrie, Ashley, Ashton, and Sandy who is no longer with them." -Jim
Dr. Robin Obenchain, MD
Internist
20940 N Tatum Blvd
Suite 125
Phoenix, AZ 85050
Dr. Sara Zakem is a board-certified radiation oncologist with expertise in the management of all cancer types using advanced techniques including brachytherapy, Stereotactic Body Radiotherapy (SBRT), Stereotactic Radiosurgery (SRS), Intensity Modulated Radiation Therapy (IMRT), Volumetric Modulated Arc Therapy (VMAT) and Image Guided Radiotherapy (IGRT). Originally from Grand Rapids, MI, Dr. Zakem served as chief resident of radiation oncology at the University of Colorado before beginning her career as a radiation oncologist at the University of Washington. She joined Arizona Center for Cancer Care after moving to Phoenix with her husband, a head and neck cancer surgeon, in 2023.
Dr. Zakem is an active member of the radiation oncology community, serving on the American Society for Radiation Oncology (ASTRO) Early Career Committee and the American College of Radiation Oncology (ACRO) New Practitioner and Communications Committees. As a resident, she additionally served as the Communications Chair for the Society for Women in Radiation Oncology (SWRO) and was elected to the Gold Humanism Honor Society by her colleagues for her commitment to providing compassionate, patient-centered care. She has authored numerous peer-reviewed publications on esophageal, pancreatic, gynecologic, and head and neck cancers.
Having been personally touched by cancer, Dr. Zakem recognizes that receiving a cancer diagnosis is often one of the most frightening and confusing times for a patient and their loved ones. She is dedicated to taking the time needed to help patients understand and navigate their cancer diagnoses, clearly communicating the role of radiation therapy and how it can best be used to help patients achieve their goals of care.
In her free time, Dr. Zakem enjoys spending time with her husband and two cats, live music, yoga, skiing, spending time outdoors, and rooting for her Michigan Wolverines - Go Blue!
Patient Reviews:
"Very friendly, careful to explain everything. Kind and caring." -Steve
Dr. Sara Zakem, MD
Radiologist
20940 N Tatum Blvd
Suite 125
Phoenix, AZ 85050