Medical Staff

Medical Staff

Our team of experienced physicians and health care professionals at the Whitaker Wellness Institute is devoted to enhancing the health of our patients. Our talented medical staff is dedicated to improving your quality of life by providing the best complementary and integrative medical treatment available. Our mission is to transform lives, one patient at a time.

Sima Mirhashemi, DOSima Mirhashemi, DO

Dr. Mirhashemi is an honors graduate of the University of California, Irvine and the Western University of Health Sciences. She completed her residency training at the University of Southern California.


Grace H. Chang, MD

Dr. Chang graduated from the University of California, Irvine College of Medicine and completed her residency at a UCLA-affiliated hospital.


Deanna Windham, DO

Dr. Windham is a graduate of Oklahoma State University College of Osteopathic Medicine. She completed her internship at Brooklyn Hospital and her residency in family practice at Chino Valley Medical Center. Dr. Windham heads up the Whitaker Wellness hyperbaric oxygen department.

Mark Filidei, DO


Dr. Filidei  received his undergraduate degree in physiology from the University of California Davis and his medical degree from UNT Health Science Center in Texas. He completed his internship at Tulane University and his residency in Internal Medicine at Brown University. He has treated thousands of patients for acute and chronic medical conditions including heart disease, diabetes, arthritis, chronic pain, fibromyalgia, as well as preventive and anti-aging medicine including bioidentical hormone therapy. 

Kim Hecht, DO

Kim Hecht DO headshot 2 crop

Dr. Hecht earned her medical degree from the College of Osteopathic Medicine of the Pacific in Pomona, California. She completed an internship at the Downey Regional Medical Center and completed her residency in physical medicine and rehabilitation at the University of California Irvine Medical Center. Dr. Hecht’s valuable training in Chinese medicine, osteopathy, and physical medicine has provided her extensive experience in treating a wide range of conditions while focusing on the body’s ability to heal itself.  

Additional Medical Staff


Vicki Weissler, LAC, OMD

Dr. Weissler is a Doctor of Oriental Medicine and a board-certified licensed acupuncturist. A graduate of the International College of Oriental Medicine in England, she has practiced acupuncture for more than 25 years in medical offices and hospital settings.


Zengshun Wang, Licensed Acupuncturist

Dr. Wang graduated from Zhongshan Medical University in 1976, where he studied both western medicine and acupuncture. He continued his education in cardiology at Beijing University. In addition to practicing acupuncture, Dr. Wang also supervises the Whitaker Wellness Institute’s diagnostics department.

b-porteusBrian J. Porteous, DC, QME

Dr. Porteous, a graduate of Cleveland Chiropractic College, has been practicing chiropractic care for more than 30 years. He is a past president of the International Chiropractors Association of California and has been awarded a prestigious Fellowship by the Palmer Academy of Chiropractic.

What’s the difference between a medical doctor (MD) and a doctor of osteopathic medicine (DO)?

All licensed physicians, whether they are MDs (Medical Doctor) or DOs (Doctor of Osteopathy), have similar education and training. Both require four-year undergraduate degrees, with an emphasis in the sciences, followed by four years of post-graduate medical education. MDs and DOs both choose specialties after completing their residency programs—which typically calls for an additional two to six years of medical training. They must both pass similar licensing examinations in order to practice medicine. Most important, both MDs and DOs are medical doctors who can prescribe medications, perform surgeries, and treat patients in hospital and clinical settings.

One-Stop Shop for Wellness

Renowned physician, author, and speaker, Julian Whitaker, MD, opened the doors of the Whitaker Wellness Institute in 1979. Since then, our clinic and medical staff have helped more than 45,000 patients overcome serious health challenges and get back on the road to healthy living. We’re proud to offer nearly two dozen safe, innovative, healing therapies under one roof—that’s more than any other facility in the northern hemisphere. Just think of us as your “one-stop shop for wellness.”

To learn more about how the Whitaker Wellness Institute’s knowledgeable and proffesional medical staff can help restore your health and vitality, click on the buttons below to schedule a complimentary consultation or contact us to learn more. You can also schedule your complimentary consultation or obtain more information by calling our Patient Services Representatives at (866) 944-8253.

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