Our Providers

Amisha Parekh, MD, MPH, FACEP

Dr. Parekh graduated from medical school in 2007 and completed residency training at the New York Methodist Hospital in Brooklyn, NY. Dr. Parekh is a Fellow of the American College of Emergency Physicians and has been Board Certified since 2013. She has completed training in Advanced Cardiac Life Support, Advanced Trauma Life Support, and Pediatric Advanced Life Support. In addition to her medical training, Dr. Parekh has also completed a Masters of Public Health at the Medical College of Ohio. She is an Assistant Professor at the Weill Cornell Medical Center and is available for consultation at the clinic for both urgent and primary care matters. She is licensed to practice medicine in Oregon, Washington, and New York. Dr. Parekh continues to practice full time in an Emergency Department setting.

Robert Birkhahn, MD, FACEP, AAFP

Dr. Birkhahn is an active member of the American Academy of Family Physicians and a Fellow in the American College of Emergency Physicians. Dr. Birkhahn graduated from the University of Cincinnati, completed residency training at the New York Methodist Hospital in Brooklyn, NY and received his Masters from Cornell University in Clinical Epidemiology and Health Services Research. He is Board Certified by ABEM and has been trained in Advanced Cardiac Life Support, Advanced Trauma Life Support, and Pediatric Advanced Life Support. Dr. Birkhahn is a Professor at the Weill Cornell Medical Center in New York and has produced more than 70 peer-reviewed publications, conducted more than 50 clinical research trials, and still actively teaches medical students, paramedics, residency candidates and clinical fellows. In his spare time Dr. Birkhahn volunteers as a Primary Care Physician providing free medical care at the Southwest Community Health Center in Hillsboro.

Elliot Taxman ND, MS, Assistant Medical Director

Dr. Elliot Taxman is a licensed naturopathic physician. He completed a three-year CNME accredited residency in primary care. He graduated with honors from NUNM in 2017 with a Doctorate in Naturopathic Medicine and a Masters of Science in Integrative Medicine Research. His masters’ thesis, Conceptualizing Integrative Medicine: A Qualitative Study Using Focus Groups, provided further insight into healthcare and clinical practice. As a student, he was the president of the Student Alliance for Integrative Medicine, where he worked to foster an integrative medical community in Portland. He has a passion for clinical integrative primary care and family practice.

Dr. Taxman has completed several integrative rotations, globally and locally, in multiple hospitals and private clinical settings. He draws on this experience to develop individualized and evidence-informed treatment plans for every patient. Dr. Taxman is excited to continue to help make modern naturopathic primary care more available to the community.

Outside of the clinic, Dr. Taxman is an avid sports fan and enjoys being active outdoors, at the gym, or playing ice hocky, tennis, paddle boarding, traveling, exploring the arts, cooking, and spending time with his lovely wife and friends.

Summer Massina, FNP-C

Summer Massina is a Board-Certified Family Nurse Practitioner. Summer recently moved to Portland from Iowa with her husband. She has worked in the health field for the past 13 years. She received her BSN and worked as a RN on a surgical unit until 2018 while going to school for her nurse practitioner. She graduated from the University of Cincinnati in 2017 with a Master’s Degree in Nursing Science for Family Practice. From 2018-2022, she worked in an Orthopedic Clinic before moving to Portland. She is excited to have joined the Pearl Health Center team and to follow her true passion of being in Family Practice. She is looking forward to building long-lasting and trusting relationships with patients to assist them in their journey of healthy living though compassionate and evidence-based care. Summer and her husband are also excited to set down their roots in Portland with their black lab and two cats and to explore what the state of Oregon has to offer including the food scene, entertainment and outdoor activities including hiking and camping.  

Andrea Del-Olmo

Dr. Del-Olmo graduated from National University of Natural Medicine in 2013 with a certificate in Natural Childbirth/Obstetrics and advanced training in minor surgery and IV therapy. After completing a 2-year residency, she went on to work as full-time faculty at the university until 2018. At that time, she was called to focus more on her clinical practice and joined Pearl Heath Center as a primary care provider. Despite the primary care nature of her practice, she was able to focus on women’s health and dermatological concerns. She is excited to continue at Pearl Health Center in a new capacity where she will be focusing her practice on women’s health, cervical cancer screening, contraception counseling/implementation and hormone related health concerns. Dr. Del-Olmo continues to teach as adjunct faculty at NUNM and is an active member of the American Association of Naturopathic Physicians. Dr. Del-Olmo grew up in Northern California as an avid surfer and sailor and spent years living in Central America and chartering boats from Spain to NW Africa, across the Atlantic and up through the Caribbean. When not working you can find her enjoying time with her family enjoying the beautiful Oregon outdoors.

Dr. Nicholi H. Khajavei

Dr. Nicholi H. Khajavei, DC, graduated from The University of Western States in 2017 as a doctor of chiropractic, and also has bachelor’s degrees in human biology, psychology, and public health. He joined The Pearl Health Center in January of 2018. In his treatments, he practices diversified adjusting techniques and utilizes flexion/distraction, soft tissue manipulation, Rock Tape®, postural training, nutritional advice and exercise in order to help each, individual patient reach their personal goals and optimum health. He strives to educate his patients so they understand their own body and also to teach them self-management techniques to better manage their health. Conditions that can be treated by chiropractic care include: neck and back pain, sciatica, disc herniations, headaches, TMJ dysfunction, and general muscle or joint pain.

Dr. Khajavei is happily married with two teenage boys, a wolf-dog (Shadow), a miniature pinscher (Hercules), and cat (Cleo-the boss!). He enjoys spending time with his family and friends, snowboarding, riding motorcycles, mountain biking, running Hood to Coast, hiking, and playing with his fur babies.

Darren Brooks, L.Ac

Darren is a licensed and national board certified acupuncturist with many years experience helping patients of all ages with their healing process. His training encompasses a number of classical healing practices, including teaching classical meditation and therapeutic exercises.

Darren encourages an integrative medicine approach, where a patient has support from all their practitioners to achieve optimal health and wellness in body and mind. Acupuncture treatments are a wonderful way to assist in the care of a wide variety of conditions and to help healing of the whole person.

Jeremy Adversalo, LPC

Jeremy is a licensed professional counseling (LPC), and received his Master of Arts in Counseling Psychology from Pacific University. Jeremy has provided mental health services for a wide range of individuals, including those impacted by depression, anxiety, trauma, loss, substance use, and challenging life transitions. Jeremy believes it is important for mental health treatment to be tailored to our clients’ wants and needs. Through this collaborative process, clients are able to identify their own personal goals, and begin to develop a meaningful and fulfilling life. When Jeremy is not working, he enjoys spending time with his wife, playing fetch with his dog, riding his bike, and going to music concerts.

Megan Couture, Professional Counselor Associate

Megan (she/her) is a National Board-Certified Counselor with an interest in working collaboratively with patients to meet their health and wellness goals in a way that is supportive, kind, and compassionate.
A native of Georgia, Megan spent her formative years in the southeastern U.S. and graduated from North Carolina Central University with a master’s degree in clinical mental health counseling. She completed a year-long internship in integrated behavioral health counseling at Outside In and gained broad experience working with adults of all ages. Prior to becoming a counselor, Megan worked as a research assistant on health behavior studies which focused on expanding care to vulnerable populations. In her free time, she enjoys spending time with her pets and connecting with the local community.
Megan is a Registered Professional Counseling Associate (R8105) under the supervision of Joseph Bonnell LPC, CRC, CADC III.

Isabel Hart, CHW

Isabel (Isi) Hart has lived in Portland, Oregon for her entire life, and is passionate about serving the Portland community. She has years of experience helping our patients navigate the healthcare system, and her certification as a Community Health Worker enables her to do this on a greater scale within our clinic. As a CHW, Isi can assist with connections to resources for things like food, transportation, community groups/support and housing, or applications to social services like SNAP, WIC, SSI/SSD, Oregon Health Plan, Trimet Honored Citizen Passes, Oregon Lifeline, and many others.
Isi is currently working to obtain her LCSW and plans to continue working in the field of social services and mental health. Isi hopes that throughout her career she can create more programs specific to supporting queer and trans folx, and build and amplify support systems for all members of underserved communities. In her spare time, Isi loves to hike, bike, kayak, camp, and garden!