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67 providers
Availability last updated 10/16/2025
As a first-generation American raised in Colorado by immigrant parents from Guyana and Poland—both of whom proudly served in the U.S. military—Oswaldo Grenardo, MD, MBA, MSHA, FAAFP, grew up with a deep respect for accountability, service, and cultural diversity. These early influences, coupled with a desire to improve the healthcare experience for underserved individuals, led him to start his own private practice, OG Health, in Greenwood Village, Colorado.
With over 30 years of experience in family medicine and healthcare leadership, Dr. Grenardo brings a unique blend of compassionate, personalized care and executive-level insight to his patients at OG Health, the practice he founded to reflect his vision of whole-person care. He believes great care begins with a genuine relationship—where patients feel seen, heard, and truly known by their physician.
Dr. Grenardo has held numerous high-impact roles throughout his career, including Chief Medical Officer and Chief Diversity and Inclusion Officer at Centura Health/CommonSpirit Health, Medical Director of its Clinically Integrated Network, and Dean of Admissions at the University of Colorado School of Medicine. His leadership has touched every level of the healthcare system, from clinical integration to medical education and health equity.
A Stanford University graduate with a degree in Human Biology, Dr. Grenardo later earned dual master’s degrees in Business Administration and Health Administration before completing his MD at the University of Colorado School of Medicine. He completed his Family Medicine residency at Rose Medical Center in Denver.
Outside of medicine, Dr. Grenardo is a proud father, sports enthusiast, former Stanford football player, bonsai hobbyist, and certified barbecue judge. He remains active in the community, serving on multiple nonprofit boards, including the American Heart Association Colorado, the Colorado Health Foundation, and the Boys & Girls Clubs of Metro Denver—working to improve health and opportunity across Colorado.
Dr. Oswaldo Grenardo, MD, MBA, MS
Family Physician
385 Inverness Pkwy
Ste 130
Greenwood Village, CO 80112
Medical School: Loyola University Stritch School of Medicine – Chicago, IL
Internal Medicine: Exempla St. Joseph Hospital – Denver, CO
Diagnostic Radiology: University of Colorado – Aurora, CO
Interventional Radiology: Medical College of Wisconsin – Milwaukee, WI
American Board of Radiology 2016
Tony Brown, MD, is the Medical Director and a board-certified vascular and interventional radiologist specializing in pelvic stabilization and kyphoplasty at RIA Endovascular. Dr. Brown sees patients at the practice's location in Greenwood Village, Colorado.
He pursued medical school at Loyola University Stritch School of Medicine in Chicago, Illinois, followed by an internship in Internal Medicine at Exempla St. Joseph Hospital in Denver, Colorado, and a residency in Diagnostic Radiology at the University of Colorado in Aurora.
Dr. Brown completed his fellowship in Interventional Radiology at the Medical College of Wisconsin in Milwaukee.
He has contributed to a number of publications and presentations, such as:
In 2016, Dr. Brown obtained board certification from the American Board of Radiology (ABR).
He is committed to caring for patients at RIA Endovascular and truly provides exceptional care.
Dr. Anthony Brown, MD
Radiologist
8200 E Belleview Ave
Suite 600E, East Tower
Greenwood Village, CO 80111
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Nationally Board Certified
Physician Assistant
Heather Whiting is a native of Colorado and has been fortunate to serve the community as a physician assistant and patient care advocate since 2003.
She began her pursuit of a career in medicine at the University of Northern Colorado where she earned a Bachelors and a Masters degree in Human Biology. Upon graduation, Heather worked at the University of Colorado Hospital as a Rehab Therapy Technician. She later graduated from the Physician Assistant program at Red Rocks Community College in Lakewood, Colorado with honors and earned a second Master’s degree, a Masters of Medical Science from Saint Francis University.
Heather is very passionate about medicine and believes in caring for the whole patient. She enjoys working side by side with patients striving to achieve optimal physical and emotional health. She is experienced in treating patients across a wide spectrum of disease states and ages, from adolescence to geriatrics. She has special interest in disease prevention and health promotion.
Heather loves spending time with her husband and two sons. They enjoy the beautiful Rocky Mountains, camping, hiking, biking, and snowboarding.
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Heather Whiting, PAC
Family Physician
5420 South Quebec Street
Suite 100
Greenwood Village, CO 80111
Nicole Sheeder, FNP
Family Physician
8100 East Union Ave
#104
Denver, CO 80237
Kevin O’Donnell, DO, is an expert sports medicine physician at Revitalize Regenerative Orthopedics LLC in Centennial, Colorado. He is an expert in non-surgical musculoskeletal care and bio-restorative therapies. He also specializes in minimally invasive treatments for osteoarthritis and chronic soft tissue injuries.
Dr. O’Donnell is originally from West Chester, Pennsylvania, and completed medical school at Philadelphia College of Osteopathic Medicine (PCOM) and residency at Lehigh Valley Hospital in Allentown, Pennsylvania.
Dr. O’Donnell subsequently served in the United States Air Force and was named 6th Medical Group Physician of the Year. He completed a sports medicine fellowship at the University of Toledo Hospital in Ohio to further his orthopedic expertise. Dr. O’Donnell then spent 12 years in Flagstaff, Arizona, specializing in minimally invasive and cutting-edge non-operative treatments. While in Flagstaff, he cared for national and international Olympic Athletes training at high altitudes.
Dr. O’Donnell was previously an adjunct professor at A. T. Still University in Kirksville, Missouri. He looks forward to providing patients with the best possible non-surgical options available to help relieve their pain.
In his spare time, he enjoys reading, gardening, and traveling. Dr. O’Donnell also enjoys staying active. He is an avid sports fan and enjoys both participating in and watching a wide variety of sports. Dr. O’Donnell resides in Highlands Ranch with his wife, Meghan, and three energetic boys, Cole, Ryan, and Jack.
Kevin O'Donnell, DO
Orthopedic Surgeon
5161 E Arapahoe Rd
Suite 250
Centennial, CO 80122
Dr. Analice Hoffenberg, MD, MSPH
Family Physician
1780 S. Bellaire St.
302
Denver, CO 80222
Caroline Gellrick, MD
Family Physician
1776 S Jackson St #840
Denver, CO 80210
Leah Jones, NP
Family Physician
125 Rampart Way
Ste 300
Denver, CO 80230
Maisha Pesante, MD
Family Physician
4595 S Knox Ct
Englewood, CO 80110
Yasmin Pirani, MD FRCP
Radiologist
4595 S Knox Ct
Englewood, CO 80110
Rosemary Andrianakos
Family Physician
4545 E 9th Ave Ste 300
Denver, CO 80220
Val has over 14 years of healthcare and management experience. She spent nine years working as Practice Administrator and Billing Supervisor of a well-established Ophthalmology and Optometry practice. As Magnolia Medical Group's Director of Operations, she works closely with medical providers, counselors, psychiatrists, laboratory staff, medical assistants, and clinic administration staff to consistently develop and nurture a clinic atmosphere that is beneficial and conducive to helping those in recovery. Val has been with Magnolia Medical Group since May of 2021.
Val is a Colorado Native who lives with her husband and their two children. She enjoys camping, hiking, paddle boarding, and most other outdoor activities. She is also an avid reader, so if you ever need a good book recommendation, she's your girl! Val attended Colorado State University to complete a bachelor's degree in Organizational Leadership.
Valerie Lavoie, AGNP
Nurse Practitioner
2925 E. Colfax Ave.
Denver, CO 80206
Pradeep Raj Rai, MD, FASAM, is a board-certified medical doctor and a Fellow of the American Society of Medicine. He is the medical director at Magnolia Medical Group, with locations in Denver and Wheat Ridge, Colorado, and he is board-certified in addiction medicine to offer the highest-quality care to every patient he sees.
Dr. Rai received his bachelor’s degree in cellular and molecular biology from Tulane University in New Orleans, Louisiana, before going on to earn his medical degree. After working for several years in the field of addiction medicine, he founded Magnolia Medical Group to provide the residents of Colorado with resources for addiction that combine behavioral health solutions alongside effective medical care.
Dr. Rai has experience in the many forms of addiction medicine and an unceasing dedication to making a positive impact on the lives of his clients and their families.
He welcomes anyone in need of help to Magnolia Medical Group, where they can expect comprehensive, nonjudgmental treatment in a safe and compassionate environment.
Pradeep Rai, MD
Surgeon
2925 E. Colfax Ave.
Denver, CO 80206
