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Nathaniel DeNicola, MD, MSHP, FACOG, is a board-certified obstetrician and gynecologist who sees patients at Orange County OBGYN in Newport Beach. He grew up in Los Angeles and Orange County, rooting for the Dodgers and Lakers. When traveling, he always makes In-N-Out his first stop when returning to California. He enjoys bodysurfing on the peninsula in Newport Beach and taking his one-year-old daughter, Keaton, to swim class.

Nathaniel has Orange County roots: he attended high school at Santa Margarita and completed medical school at the University of California, Irvine.  

Nathaniel also has professional experience outside California: he completed residency in obstetrics and gynecology at Tulane University and still returns to New Orleans annually to present lectures and enjoy charbroiled oysters.  After residency he earned a Masters of Science in Health Policy Research (MSHP) with the Robert Wood Johnson Clinical Scholars program at the University of Pennsylvania.

Prior to returning to California in 2020, Nathaniel worked on health policy in Washington, DC, where he held a joint appointment with Johns Hopkins Medicine. He is a national leader on emerging telehealth policy and serves as the resident telehealth expert for the American College of Obstetricians and Gynecologists. He also has international leadership in environmental health policy and holds liaison roles with the American Academy of Pediatrics, the International Federation of Gynecology and Obstetrics, and the World Health Organization.

Yonatan Mahller, MD, Ph.D., provides expert obstetric and gynecologic care to women of all ages at Orange County OBGYN in Orange County. Patients can access a full range of services at his office in Newport Beach, California, where he offers well-woman care, care for low and high-risk pregnancies, pre-conception and infertility counseling and treatment for menopause. Dr. Mahller combines excellent surgical training with cutting-edge technology, including the MonaLisa Touch® laser that treats vaginal discomfort associated with menopause and urinary incontinence. He is affiliated with Hoag Hospital.

Dr. Mahller is a native of Southern California. While at the University of California at Santa Barbara, he obtained a Bachelor’s degree in physiology and a Master’s degree in molecular biology. He then relocated to the Midwest to attend the University of Cincinnati College of Medicine, where he completed a dual degree program, obtaining his M.D. and a Ph.D. in developmental biology. He then returned to California and completed residency in obstetrics and gynecology at the prestigious Cedars Sinai Medical Center in Los Angeles.

Throughout his medical training, Dr. Mahller has won numerous awards recognizing his caring bedside manner and stellar surgical skills. While in graduate school, he performed significant preclinical research studies utilizing novel anticancer agents and authored numerous publications on topics such as cancer stem cells. He has given multiple presentations at international scientific meetings. During residency, Dr. Mahller created and implemented a course for OB/GYN residents, teaching them the Spanish needed to provide care to Spanish-speaking patients.

Dr. Mahller is board certified by the American Board of Obstetrics and Gynecology (ABOG) to provide a wide range of women’s health services, including pregnancy care and delivery, gynecology, minimally invasive surgery, infertility and well-woman care. His patients can count on him to devote the time needed to answer their questions, get to the underlying cause of their symptoms, and develop an individualized treatment plan.

When he’s not caring for patients, Dr. Mahller likes to travel, cook, and spend time with his family.

Dumrong Tangchitnob, MD is an OB/GYN and cosmetic specialist at Tangchitnob MD in West Covina, California, who has been improving women’s health for more than 30 years. Specializing in minimally invasive gynecologic and robotic surgery, he is a dedicated practitioner aimed at providing excellent care to women using the most advanced treatment options available.

Dr. Tangchitnob received his medical degree from Chulalongkorn University in Bangkok, Thailand. He remained in Bangkok to complete his internship at Bhumibol Adulyadej Hospital. He then traveled to the United States to complete his pediatric and OB/GYN residency and neonatology fellowship at Jersey City Medical Center in Jersey City, New Jersey.

He is a board-certified OB/GYN and is a fellow of the American Academy of Cosmetic Surgery. Dr. Tangchitnob is also very involved in the Citrus Valley Health Foundation, serving on their board of trustees.

To better serve his diverse community, Dr. Tangchitnob speaks a number of languages including Thai, Chinese, and Spanish.

Dr. Tangchitnob combines warmth and compassion with modern medicine to improve both comfort and care for his patients.

Dr. Tangchitnob is married with two grown children. He and his son, Dr. Edward Tangchitnob, work together at Tangchitnob MD, while his daughter is an attending physician specializing in geriatrics at Kaiser Permanente.

Edward Tangchitnob, MD, MBA, FACOG, FACS is a robotic surgeon and regenerative medicine physician specializing in minimally invasive and holistic treatments for chronic diseases associated with aging. Dr. Tangchitnob’s private practice is located in West Covina, CA.

Dr. Tangchitnob performs robotic procedures for women to help treat abnormal uterine bleeding, pelvic pain, infertility, and urogynecological symptoms that occur after childbirth. After graduating from his robotic surgery and advanced endoscopic fellowship at Scripps Clinic in San Diego, CA he was recruited by Emanate Health to serve as the medical director for the developing Minimally Invasive Gynecology Surgery (MIGS) division.

In 2013, he helped secure the Center of Excellence in Minimally Invasive Gynecology (COEMIG) designation for Emanate Health. In 2016, he later led the Center of Excellence in Robotic Surgery (COERS) designation for general surgery, oncology and urology. He has served as a consultant and board advisor for several pharmaceutical and biomedical companies including Abbvie, Allergan Medtronic, Smith and Nephew, and Cooper Surgical. In 2017 he founded Timeless Health MD which focuses on holistic treatments for aging such as bioidentical hormone replacement therapy, intimacy procedures, and aesthetics medicine.

In 2021 he became one of the first gynecologic surgeons nationwide to become certified in the surgical subspecialty of Minimally Invasive Gynecologic Surgery (MIGS) by the American Board of Obstetricians and Gynecologists.

Dr. Tangchitnob earned his medical degree at Tufts University in 2008 after graduating with a B.S. in electrical and biomedical engineering at Tufts University in 2004. He served as the Executive Chief Resident during his OB/GYN residency at Cedars Sinai Medical Center. He is an active member of the American College of Surgeons (FACS) and the American Association of Gynecological Laparoscopists (AAGL). He works closely with hospital executives to build surgical and medical programs and holds an MBA from the USC Marshall School of Business.

Dr. Clark has a passion for healing and for improved patient outcomes. Following fellowship training, Dr. Clark was recruited by Hoag Hospital as the first Medical Director for the Womens Center for Continence. He received his medical degree from the University of Utah School of Medicine and completed his residency in Obstetrics and Gynecology. After completing residency, he further specialized by completing a Fellowship in Female Pelvic Medicine and Reconstructive Surgery ("Urogynecology") at Indiana University/Methodist Hospital in Indianapolis, IN.

Dr. Clark is nationally recognized for his surgical skills and teaches advanced surgical techniques to other physicians throughout the United States. In 2008, he was invited by the Jordanian government to teach advanced gynecology surgery techniques to the Ministry of Health Gynecology Division. Dr. Clark uses a wide range of surgical and laparoscopic techniques and a da Vinci® robot. He participates in the design and development of surgical instruments and uses cutting edge urogynecology surgery techniques, products, and modalities.

Professional Recognition

• Board Certified, OB/GYN
• Board Certified, Female Pelvic Medicine and Reconstructive Surgery
• Member, Phi Beta Kappa
• Fellow, American Association of Gynecologic Laparoscopists
• Invited Guest of Government of Jordan to teach minimally invasive gynecologic surgery

Dr. Clark is an active member of the Orange County community having served as a youth soccer coach for over a decade and as a Scout Master in the Newport Beach Boy Scouts program. He enjoys hiking, camping and ocean sports. You may see him rowing a scull in the Newport Bay in the early morning hours. Dr. Clark is a family man and has been married to his wife for 35 years. Together they have four children. 

Catalin Marinescu, MD, FACOG, specializes in pelvic surgery with an emphasis on minimally invasive procedures at OBGYN CARE in Newport Beach and Irvine, California. He performs gynecologic surgeries, such as hysterectomy and reconstructive procedures for prolapse or other pelvic floor defects, as well as procedures to treat urinary incontinence. Dr. Marinescu has affiliations with Hoag Hospital Newport Beach and Hoag Hospital Irvine.

Dr. Marinescu had an unparalleled 10 years of post-graduate residency training. He did a general surgery program at Carol Davila University of Medicine and Pharmacy in Bucharest, Romania and was trained in obstetrics and gynecology at the prestigious Mount Sinai Hospital Medical Center in Chicago, affiliated with Rush University.

Highly trained in obstetrics and gynecology, including infertility, Dr. Marinescu offers advanced prenatal diagnosis for high-risk pregnancies and follows the safest and most effective guidelines for delivery. His results are outstanding in difficult deliveries and minimally invasive surgeries, with over 200 da VinciⓇ robotic surgeries performed. 

Due to his unique worldly experiences on both sides of the Atlantic, Dr. Marinescu understands the impact of different cultures on each woman’s unique personality. He is attentive to each woman’s concerns and respectful of her time. He exercises great compassion and care with his patients, and works in a collaborative effort with other specialists to determine the best course of action for each patient’s specific journey. 

As a gynecologist and educator, I believe that my patients deserve to be heard and to understand their conditions and treatment options in a safe and respectful environment. Health care is a collaboration between the patient and the provider that takes into account not only physical but also emotional and social needs. Everyone is unique and should be treated as such. I am committed to providing that personal and individualized care to my patients.

As a physician, I believe that patients should be an equal partner in making decisions regarding their healthcare. That decision making should start with providing a comprehensive explanation of the condition, management options and ending with collaborative treatment solutions.

Women of all ages receive comprehensive and compassionate care by an all-female staff at Women 2 Women Medical Center in Irvine, California. Led by G. Lara Bhatnagar, MD, a board-certified OB/GYN, the warm and welcoming staff greets you with a smile from the moment you call or request an appointment online, and they go out of their way to accommodate your needs. Dr. Bhatnagar cares for each patient from the first visit, throughout their pregnancy, delivery of your baby, and beyond. As an OB/GYN for several decades, Dr. Bhatnagar has delivered over 3,000 babies and completed over 1,000 surgeries successfully, receiving several awards recognizing her care and knowledge, including the Top OB/GYN in Irvine Award and the Orange County Circle of Care Award.

Because of their ability to serve the needs of diverse populations, Women 2 Women Medical Center is one of only 21 practices nationwide to receive a competitive grant from the National Committee for Quality Assurance (NCQA).

Dr. Bhatnagar and her staff specialize in minimally invasive surgeries, including colposcopy, hysterectomy, and hysteroscopy for various gynecological issues. The doctor also provides maternity care, routine annual preventive exams, and care for complex gynecologic issues such as endometriosis, fibroids, or infertility treatment. With an all-female staff, the entire team understands the unique complex challenges women face and work with each patient to navigate the process of diagnosis and treatment. Committed to treating every patient as a whole, the mind and body connection that affects every individual’s wellbeing, Dr. Bhatnagar and her staff make the time to get to know patients as individuals to provide the highest quality care.

To schedule an appointment, call Women 2 Women Medical Center, or use the online booking tool.

Catalin Marinescu, MD, FACOG, specializes in pelvic surgery with an emphasis on minimally invasive procedures at OBGYN CARE in Newport Beach and Irvine, California. He performs gynecologic surgeries, such as hysterectomy and reconstructive procedures for prolapse or other pelvic floor defects, as well as procedures to treat urinary incontinence. Dr. Marinescu has affiliations with Hoag Hospital Newport Beach and Hoag Hospital Irvine.

Dr. Marinescu had an unparalleled 10 years of post-graduate residency training. He did a general surgery program at Carol Davila University of Medicine and Pharmacy in Bucharest, Romania and was trained in obstetrics and gynecology at the prestigious Mount Sinai Hospital Medical Center in Chicago, affiliated with Rush University.

Highly trained in obstetrics and gynecology, including infertility, Dr. Marinescu offers advanced prenatal diagnosis for high-risk pregnancies and follows the safest and most effective guidelines for delivery. His results are outstanding in difficult deliveries and minimally invasive surgeries, with over 200 da VinciⓇ robotic surgeries performed. 

Due to his unique worldly experiences on both sides of the Atlantic, Dr. Marinescu understands the impact of different cultures on each woman’s unique personality. He is attentive to each woman’s concerns and respectful of her time. He exercises great compassion and care with his patients, and works in a collaborative effort with other specialists to determine the best course of action for each patient’s specific journey. 

Dr. Simmi P. Dhaliwal is a board-certified OB/GYN physician at Femcare Medical Associates in Pomona and Ontario, California. As a Fellow of The American Congress of Obstetricians and Gynecologists, she's committed to ongoing professional education and provides patients with the highest quality health care.

Dr. Dhaliwal completed her undergraduate studies in biomedical sciences at the University of California, Riverside. She attended medical school at the University of California, Los Angeles School of Medicine from 1992-1996, and she completed her residency at Harbor UCLA Medical Center Department of OB/GYN from 1996-2000.

She was Chairman of the OB/GYN department at Pomona Valley Hospital from 2007-2008, 2009-2010, and 2015-2016. Dr. Dhaliwal has been board-certified by the American Board of OB/GYN since 2003.

Dr. Dhaliwal has lived in the area since she was 15-years-old and attended all local schools. In her spare time, she enjoys reading, bike riding at the beach, shuttling her three kids to soccer, and walking her Labrador puppy.

Dr. Maggie Pham is a board certified OB/GYN physician. She is originally from San Jose, California, and graduated with a BS in Physiology from UCLA. She completed her medical school education at Western University of Health Sciences in Pomona, California, and did her OB/GYN residency at Advocate Illinois Masonic Medical Center in Chicago, IL.

Training in a smaller metropolitan community residency program has allowed her to gain an incredible breadth of experience and volume, including extensive training in minimally invasive gynecologic surgeries. In addition, training at a Level 3 Perinatal hospital and high-risk obstetrics referral center has also given her the opportunity to manage a large variety of complex high-risk pregnancies.

Dr. Pham strongly believes in providing quality health care to a diverse population, especially to underserved communities. She is very passionate about obstetrics and gynecology and strives to provide comprehensive patient-centered care to her patients. She is excited to join the FemCare team and provide quality women's health care to the Pomona Valley community.

In her spare time, Dr. Pham enjoys reading, cooking, hiking, and traveling the world.

Karie McMurray MD, FACOG, is a board-certified OB-GYN helping patients in her office at Conejo Women’s Medical Center, located in Thousand Oaks, California in the Conejo Valley area near Westlake Village. She’s devoted to serving all the health care needs of women in a warm and caring environment, including bioidentical hormone therapy, osteoporosis, polycystic ovarian syndrome, incontinence, birth control, body contouring, and many other gynecologic needs.

Dr. McMurray has been involved in health care for over 25 years. She graduated from USC School of Medicine, received a master’s degree in nursing from UCLA, and a Bachelor of Science in Nursing from the University of Utah. Dr. McMurray is trained in general obstetrics and gynecology, family practice, and certified in da Vinci® minimally invasive robotic surgery. She is certified in MonaLisa Touch and SculpSure laser therapy. For more than 20 years of experience prescribing bio-identical hormones, she is a specialist in the hormonal needs of patients from adolescence through menopause.

She and her husband Dr. Kyle Himsl, live in Westlake Village with their two children. 

OB/GYN Dr. Maryam Ardalan of Women Elite Care, Inc. in Valencia, California, chose her life-long career path when she was only thirteen years old. Her passion for helping heal members of her community made her pursue medical training. She attended the West Azerbaijan University of Medical Sciences in Iran. During her medical externship, she began to love the field of Obstetrics and Gynecology. She was fascinated by how educating and treating women would help them live long and healthy lives.

Once she finished her externship, Dr. Ardalan completed four years of residency training as an OB/GYN. She graduated with honors and began working with diagnosing and treating infertile couples. Throughout the years she has participated in multiple research projects involving infertility.

Following completion of residency training in Iran, Dr. Ardalan began work in the rural areas of Northwestern Iran. She later had the opportunity to participate in an OB/GYN clinical rotation in Vienna, Austria for a year.

After finishing her rotation in Austria, she immigrated to the United States with her family. Her love and dedication to Obstetrics and Gynecology gave her the drive to successfully complete the Medical Board examinations and re-enter four years of residency at Harbor-UCLA Medical Center. Upon completion, she started a position at the University of San Francisco as an assistant professor in the department of OB/GYN for two years where she was tasked with instructing medical students and residents. Dr. Ardalan moved to Valencia, California, shortly after and has been working in the area since 2009.

Dr. Ardalan’s mission is to provide quality medical care in a professional, supportive, and loving environment.

She is a member of numerous medical societies including AMA (American Medical Association), ACOG (American Academy of Obstetrics and Gynecology), and AAGL (American Association of Gynecologic Laparoscopists).

At Valencia Center for Women’s Health, Dr. Navid Navizadeh is a leading provider of women’s health services including obstetrics and gynecology. Patients throughout the Valencia, California area, can receive services such as fetal testing, family planning, minimally invasive procedures, genetic counseling, gynecological cancers screening, laparoscopic surgery, 4D/3D ultrasounds, hysteroscopy, and pelvic reconstruction as well as care for infertility, menopause, urinary incontinence, and osteoporosis.

Dr. Navizadeh is the founder and medical director of Valencia Center for Women’s Health. He received his undergraduate degree in genetics and molecular biology at the University of California. Dr. Navizadeh completed a comprehensive research fellowship in molecular and cell biology at the University of California at San Francisco (UCSF). He further expanded his research experience at the University of Southern California’s School of Medicine, where he obtained his medical degree.

At the USC School of Medicine, Dr. Navizadeh had the chance to work on innovative research projects in the fields of obstetrics, gynecology, endocrinology, infertility, and ultrasound imaging. He investigated the effects of seizure disorders and the treatment programs in pregnancy. Dr. Navizadeh was awarded the Pacific Coast Fertility Society’s award in Estrogen research.

Dr. Navizadeh completed an internship in Obstetrics at the Parkland Memorial Hospital in Dallas, Texas. He continued his residency at Mount Sinai-Maimonides Medical Center in New York. In obstetrics, his group’s work in ultrasonography to predicate preterm labor was published and received several awards. In the area of infertility and endocrinology, Dr. Navizadeh's works contributed to the understanding of the effects of an embryo’s size and quality in the process of in-vitro fertilization (IVF). Dr. Navizadeh completed the prestigious Galloway fellowship at the Memorial Sloan-Kettering Cancer Center in New York City. There, he had the opportunity to advance his surgical skills in complex gynecological operations in addition to learning the latest laparoscopic and endoscope techniques.

Dr. Navizadeh has also expanded his interest to urogynecology and pelvic surgery. In southern California, he pioneered the use of the new Transopturator Sling procedure for treating female urinary incontinence.

Valencia Center for Women’s Health and Dr. Navizadeh welcome all new patients to the practice and can work with most forms of medical insurance.