Previous Next Michael is a board certified psychiatric nurse practitioner who specializes in treating individuals struggling with anxiety, depression, bipolar disorder, ADHD, and other mental health disorders. He received his bachelor’s degree from Wright State University in 1999 and worked in a wide array of settings taking care of geriatrics, adults, and pediatric patients. Through this experience, he has developed a compassion for wanting to help and treat individuals with mental health concerns. Michael completed his Master’s of Science in Nursing from Eastern Kentucky University in the field of Psychiatric-Mental Health across the lifespan. He believes the best possible outcomes can be provided through a variety of different treatment options tailored to each individual including medication management with components of cognitive behavioral and supportive therapy. He believes that developing a strong therapeutic relationship with his clients and working together as a team is the best way to maximize outcomes. Michael is married with 4 children who keeps him quite busy. In his spare time, he loves to root for all the local sports teams as he is a die hard fan. He also enjoys traveling especially internationally so that he can experience different cultures and food. Michael Zadakis PMHNP-BC

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Get comprehensive Nephrology care from the highly skilled team at American Medical Associates. Our expert Nephrologists offer cutting-edge treatments and personalized care for all kidney-related conditions. Schedule an appointment now. Nephrology Dr. Khan is a board-qualified Nephrologist practicing with this practice since 2008. Dr. Khan also works at several East Valley hospitals including Chandler Regional Medical Center, Mercy Gilbert Medical Center and the Banner health facilities. Dr. Khan completed his residency in Internal Medicine in 2007 at Lutheran Medical Center in Brooklyn NY. He practiced as an Internal Medicine physician for over 6 years prior to completing his fellowship in Nephrology in 2017 from University of Arizona (UofA) in Tucson, AZ. He currently resides in Gilbert, AZ with his wife and 4 children. In his time off, Dr Khan loves to travel and spend time with their family. He is vested in the well being of his patients, not only from a renal, but also from an internal medicine stand point. He has extensive background and experience in civil & structural engineering as well as construction projects. He builds enthusiast level computers for relaxation. He works on and modifies performance automobiles and machinery as a hobby in his free time. His favorite author is Stephen Hawking and is a huge fan of all his work towards the field of theoretical astrophysics. He finds it relaxing to build, modify and fix things. Hassan Khan, MD Nephrology Director Nephrology (All age's) Nephrology is a medical specialty focused on the diagnosis and treatment of diseases and disorders related to the kidneys and their associated systems. Nephrologists are Physicians who specialize in nephrology and our experts in managing conditions that affect kidney functions and overall renal health. Conditions treated under nephrology include: Chronic Kidney Disease (CKD) Acute Kidney Injury (AKI) Hypertension (High Blood Pressure) Glomerular Diseases Renal Tubular Disorders Kidney Stones Fluid and Electrolyte Disorders End-Stage Renal Disease (ESRD) Overall, Nephrology encompasses, the diagnosis, treatment, and management of a wide range of kidney related conditions, with the goal of preserving kidney function, improving quality of life, and releasing the risk of complications for patients with Renal Disease.

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Previous Next Dr. Nadir is a Board-Certified Internal Medicine Physician and completed her residency here in Arizona at Maricopa County and Good Samaritan Medical Center in 2006. In addition to practicing with American Medical Associates (AMA) in a Primary Care setting, Dr. Nadir also works full time as a Hospitalist for Dignity Health including Chandler Regional and Mercy Gilbert Hospitals. With a broad scope of practice, Dr. Nadir aims to provide comprehensive care for her patients including early diagnosis and treatment. Dr. Nadir is also a Licensed Cosmetic Injector and owns and oversees treatments and procedures done at Vitalize Med Spa (VMS) and Vitalize Infusion Center (VIC). Dr Nadir did her late schooling in NY and has lived in several different states but then decided to settle in Arizona after she came here in 2001. She currently resides in Gilbert, AZ with her husband and 4 kids. In her time off, she likes to travel and spend time with her family. Her favorite vacation spot is a beach. Ehreema Nadir, MD Chief Executive Officer (CEO)

Previous Next Marie Brewer, FNP-C Family Nurse Practitioner Marie Brewer, FNP-C, epitomizes professional excellence as a family nurse practitioner with a robust educational and clinical background. An alumnus of Creighton University in Omaha, Nebraska, Ms. Brewer was distinguished with an athletic scholarship and procured a Bachelor of Arts in Corporate Communication, with a specialization in Public Relations. Her aspirations in the healthcare domain propelled her to acquire a Bachelor of Science in Nursing from Northern Kentucky University, where she graduated Magna Cum Laude in 2005. Further cementing her academic achievements, Ms. Brewer attained her Master of Science in Nursing with Summa Cum Laude distinction from The University of Phoenix in 2021. Her clinical journey commenced at St. Elizabeth’s Medical Center in Edgewood, Kentucky, where she specialized in orthopedics as a registered nurse. In 2008, Ms. Brewer relocated to Arizona, enhancing her clinical expertise in the Cardiovascular Intensive Care Unit at Banner Good Samaritan Medical Center, Phoenix. There, she delivered critical care to patients navigating the recovery process from cardiac events and surgeries. Recognizing a broader spectrum of patient care, she expanded her proficiency by contributing to both the Emergency Department and Intensive Care Unit. Her passion for knowledge transfer led her to mentor nursing and paramedic students, as well as to orient new staff members. Ms. Brewer holds certification through the American Academy of Nurse Practitioners and maintains an active membership with the Sigma Theta Tau National Honor Society, underscoring her commitment to nursing excellence. Ms. Brewer’s career trajectory evolved as she assumed the role of a Clinical Education Specialist for Emergency and Trauma services, an endeavor that garnered her a nomination for the prestigious March of Dimes 2015 Nurse of the Year in Education. In 2016, she rejoined direct patient care as a night shift charge nurse in the Intensive Care Unit with Dignity Health, reaffirming her dedication to patient-centric care. Prior to joining our team, Ms. Brewer honed her expertise at The Fitzmaurice Hand Institute, where she specialized in the management of a comprehensive array of acute and chronic upper extremity conditions. A native of Orange County, California, Ms. Brewer found her home in Arizona’s Valley of the Sun in 2007. Outside of her professional responsibilities, she is a devoted mother to two exceptional sons who infuse her life with vitality. An avid sports enthusiast with a love for the great outdoors, Ms. Brewer cherishes her time with friends and family, which remains integral to her personal well-being. Marie Brewer FNP-C

Previous Next Marion’s nursing career started in 2006. She has worked in the Emergency Department at various facilities in the East Valley for almost ten years and in Post Anesthesia Care Unit for eight years. She has cared for patients from all walks of life during their most vulnerable times. Marion earned her Master’s degree in Nursing with an emphasis on Psychiatry at Walden University. She has gained rewarding and relevant experience during her clinical rotations at various mental health facilities. She is fluent in Tagalog and is familiar with the Asian culture. Her professional membership includes Arizona Nurses Association and American Psychiatric Nurses Association. During her free time, Marion likes to spend time with her family and go on long drives. She also enjoys trying new places to eat and going on Target/Trader Joe’s run. Marion Crisostomo PMHNP-BC

Previous Next David is originally from Illinois and relocated to the Phoenix area in 2016. He holds a BSN from The University of St. Francis in IL. His MSN, with a concentration in education, was achieved at Grand Canyon University in 2020. David harbors a passion for education, considering it a fundamental component of healthcare for both patients and staff. In May 2023, he accomplished a significant milestone by receiving a Post Master's FNP degree from Grand Canyon University. During his studies, David undertook rotations in cardiology, endocrinology, and primary care medicine. He's now thrilled to commence his practice with AMA, dedicated to serving the community to the utmost of his ability. Before joining AMA, David accumulated vast experience as a pediatric ICU nurse for five years and also spent two years working with adult patients in a progressive care unit. This diverse professional background has equipped him to provide care for individuals from all walks of life. He's committed to offering his patients kind, compassionate, and holistic care, ensuring they feel they are receiving the best possible treatment. On the personal front, he's married to his wonderful wife and is the proud parent of twin daughters, whom David considers his greatest blessings. Leisure time is often spent with family, engaging in various activities, with a particular fondness for the outdoors. David Brennan FNP-C

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