Joseph E. Pierson, MD began his professional career with undergraduate studies at UC Irvine. He attended medical school at UCLA, then went on to complete his residency at Emory University Grady Memorial Hospital with an emphasis upon Pediatrics and Internal Medicine. He is currently a member of the clinical staff at Southern California Hospital. He is also affiliated with California Hospital Medical Center, Silverlake Hospital, Gardena Memorial Hospital, and many more throughout the Los Angeles area. 

Dr. Pierson is the Medical Director and CEO of Allied Health Solutions Medical Group. In this role, he strives to provide Comprehensive Inpatient and Outpatient Care services for adults and children as well as to provide Women’s health and preventive health care within several communities.

Dr. Pierson's main objective is to develop a broader system of health care, improve the health of the general population, improve healthcare outcomes, and increase efficiency within a Medical Home Model. He strives to develop a robust system through strategic partnerships among physicians, specialists, hospitals, and community health centers.

Outside of his passion for his practice, Dr. Pierson enjoys billiards, traveling, bicycling, chess, and competitive sports.

Dr. Sasan Massachi is a board-certified internal medicine specialist located in Beverly Hills, CA. His office facilities are equipped with a range of services for men and women including annual physicals, vaccinations, ultrasounds, digital x-rays, bone density scans, and EKG stress tests. Additionally, he offers patients the convenience of an in-house laboratory, ensuring expedited test results for his patients. Preventative care is paramount to Dr. Massachi's practice, as he specializes in the most innovative techniques available through modern medicine today. Additionally, Dr. Massachi assists patients with identifying healthy practices and behaviors to incorporate into their daily lives that can stave off common illnesses. 

 

Dr. Massachi received his undergraduate degree at the University of California, Los Angeles, and attended medical school at the University of California, San Diego. Upon graduating, Dr. Massachi completed his internship and residency at Cedars-Sinai Medical Center in Los Angeles. He is credentialed with a California State Medical License and certified with the American Board of Internal Medicine. After graduating in 2010 from his residency program, Dr. Massachi joined the prestigious physicians group at Century City Primary Care, and recently opened a new state of the art office in Beverly Hills. 

 

Additionally, Dr. Massachi remains affiliated with Cedars-Sinai Medical Center, performing a variety of procedures and overseeing inpatient care. Dr. Massachi's unique personal approach extends absolute courtesy, empathy, discretion, and respect to each of his patients, ensuring you receive foremost care and treatment in a comfortable and stress-free environment. 

 

To schedule an appointment please call 310-553-3013 or visit www.sasanmassachi.com/ and click on the ‘Request Appointment’ button.

Shaghayegh “Sherri” Tavassoli, DO, is the leading provider and family medicine specialist at Beverly Hills Medical Institute, serving patients in Beverly Hills, West Hollywood, and surrounding areas in west-central Los Angeles County, California. 

 

Dr. Tavassoli graduated with her Bachelor of Science from the University of California, Los Angeles. Shortly after, she earned her Doctor of Osteopathy at the Western University of Health Sciences in Pomona, California. She commenced her post-graduate journey through internship, residency, and fellowship in family medicine. 

 

Dr. Tavassoli has a heart and passion for patient care, specifically in preventive family medicine. She sees firsthand how patients, especially those uninsured or underinsured, can struggle to receive proper medical care. With a focus on preventive care, Dr. Tavassoli makes it a personal mission to make herself the “medical home” of her patients. 

 

Practicing preventive medicine helps keep patients healthy and avoid future issues, so visiting Beverly Hills Medical Institute for your physicals, preoperative evaluations, and check-ups is essential. If you are struggling with a chronic condition, Dr. Tavassoli offers chronic disease management to help you manage your symptoms and improve your quality of life. Dr. Tavassoli’s unique, holistic approach to family medicine can help you and your loved ones get and stay healthy.  

 

Dr. Tavassoli is currently a member of the American Academy of Family Physicians, the American Osteopathic Association, and the American College of Osteopathic Family Physicians. She is fluent in English and Farsi and conversational in Spanish to best serve her patients. 

 

Dr. Tavassoli is excited to welcome patients to the practice to put their care and wellness first. Call the office or book online today to schedule a consultation at Beverly Hills Medical Institute.

After many years of medical practice, my patients have taught me a great deal about what they desire and expect from their primary care physician. I take great pride in practicing in a comfortable, clean, private, state-of-the-art medical office. We are open-minded, empathetic, focused on preventive care and are willing to combine traditional Western medicine with selected alternative therapies to meet our patients needs.

MEET OUR PROVIDER - KATHRYN PAWELEK

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Katie Pawelek, MSN, APRN, FNP-C, is a dedicated Family Nurse Practitioner with a passion for delivering patient-centered care at Temecula Medical Group. With over a decade of experience in nursing, Katie brings a wealth of expertise from her work in cardiology, emergency services, and surgical care across prestigious institutions like Scripps Green Hospital and Houston Methodist Willowbrook Hospital. Holding advanced certifications including FNP-C, CEN, and ACLS, she excels in managing acute and chronic conditions with a focus on empowering patients through education and compassionate care.

Katie’s approach to healthcare is rooted in her commitment to timely, individualized treatment plans that enable patients to understand and manage their health effectively. Her extensive background in high-acuity settings, such as Level I Trauma and STEMI Receiving Centers, has honed her ability to make critical decisions and collaborate seamlessly with interdisciplinary teams. At Temecula Medical Group, she provides comprehensive care, from ordering and interpreting diagnostics to performing procedures and furnishing medications.

Outside of her professional life, Katie is an active mother who can often be found cheering on her children at volleyball games or baseball fields. A lover of the outdoors, she enjoys music, dancing, art, and home decorating, bringing the same warmth and creativity to her patient interactions. Katie’s blend of clinical excellence and genuine care makes her a trusted provider for families in the Temecula community.

 

"I believe in treating every patient like family, listening to their needs, and guiding them with care and compassion."

 

KATIE PAWELEK's Care Connect Profile

With a strong foundation in healthcare, I've dedicated myself to the well-being of others as a Registered Nurse and Family Nurse Practitioner (FNP). My medical background enables me to provide compassionate care and personalized solutions to meet the diverse needs of my patients. I am committed to enhancing the lives of my clients. Through wellness consultations, IV drips, and vitamin injections, I empower individuals to prioritize their health and vitality. Whether it's boosting energy levels, enhancing immunity, or promoting overall wellness, I'm dedicated to helping my clients feel their best from the inside out. My mission is simple yet profound - to make a positive impact on the lives of everyone I encounter. With my commitment to wellness, I strive to inspire and uplift those around me, one smile, and one wellness session at a time. Let's embark on this journey together, towards a healthier, happier, and more vibrant life!

Discovering the path to better sleep should be about comfort. That’s why we keep the sleep apnea journey as streamlined as possible—cutting hassle and giving you more time to take your sleep back sooner. We’re also focused on removing stigma and misconceptions. Anyone can discover that they are dealing with sleep apnea. Which is why we believe in making it easier for everyone to get a handle on their sleep health. By improving awareness, understanding, and access to sleep apnea treatment, we can wake up to a world where healthy rest is always within reach.

Pouya Shafipour, MD, in Santa Monica, California, is a board-certified family medicine specialist with subspecialty training in a field of medicine known as bariatric or obesity medicine. He uses safe and effective medications in conjunction with dietary, nutritional, behavioral, and exercise counseling to manage obesity and medical conditions related to excessive weight gain or loss.

After finishing his residency, Dr. Shafipour pursued his passion in obesity treatment. Through extensive training by the American Society of Bariatric Physicians and the prestigious Harvard Blackburn Obesity Course, Dr. Shafipour has developed a program that focuses on healthy weight loss and a well-organized maintenance program. His program results in weight loss and maintenance of a healthy weight through a multi-level, personalized approach to dietary and lifestyle transformation.

Dr. Shafipour received his bachelor’s degree in molecular and cell biology from UC Berkeley, then continued his graduate studies and received a master’s degree in physiology and biophysics from Georgetown University. He later attended Loma Linda University School of Medicine, where he received his MD in 2003. He completed his internship in general surgery at UC Irvine and residency in family medicine at UCLA and became board certified in family medicine in 2008.

During a peak performance health and lifestyle coaching conference in 2004, Dr. Shafipour discovered an interest in lifestyle transformation. Following the conference, he personally took some radical measures and transformed his way of eating and implemented daily exercise into his life.

The impact of this transformation encouraged him to further pursue incorporating the idea of a sustainable, healthy lifestyle into his practice of medicine. Dr. Shafipour continued his training in bariatric medicine by taking courses offered through the American Society of Bariatric Physicians.

Ella graduated in June 2025 from the University of California, Irvine with a Bachelor of Arts in Psychological Sciences. With an interest in both therapy and administrative work, she was drawn to Mind Health Institute, Orange County. Ella is excited to make connections with patients and give them the best possible experiences at Mind Health Institute, Orange County.

Dr. Kathy Zelken is returning as an aesthetic medicine provider after a hiatus since the birth of her daughters. She has served as the medical advisor of the Zelken Institute for Aesthetic Medicine since it was established in 2016. She has worked tirelessly in the background to ensure the highest level of excellence and quality in all aspects of patient care. She has had a keen eye for artistry since childhood, starting from being a classically trained artist. She graduated summa cum laude from the University of California Berkeley with a major in Molecular and Cell Biology and a minor in Art History. During medical school at the University of Texas Southwestern, she published papers with world-renowned plastic surgeon and former editor-in-chief of Plastic and Reconstructive Surgery journal (the top journal in the field), Dr. Rod Rohrich. Her meticulous nature, extraordinary calmness, and friendly demeanor gained from close to a decade of working as a board-certified pediatrician in Orange County and doing some of the most delicate procedures on tiny babies will put the most anxious patients at ease. She is thrilled to help patients map out a comprehensive treatment plan to achieve their individual aesthetic goals and explain various nonsurgical procedures in detail. Her patients love her and seek her out for neuromodulator and facial contouring injections, skin rejuvenation, laser treatments, and so much more.