Find a Top Family Doctor Near Me in Castle Rock, CO – Book an Appointment Instantly

Timothy Taylor, DO, CAQSM, is a dual-board-certified physician in family medicine and sports medicine, helping patients restore movement, relieve pain, and return to the activities they love. At Breakthrough Regenerative Orthopedics in Boulder, Colorado, Dr. Taylor offers advanced non-surgical treatments for joint, muscle, tendon, and ligament injuries, utilizing state-of-the-art techniques such as ultrasound-guided platelet-rich plasma (PRP), prolotherapy, and regenerative injections. His patient-centered approach focuses on promoting natural healing, enhancing function, and helping athletes and active individuals of all levels recover safely.

Dr. Taylor completed his fellowship in primary care sports medicine at Campbell University, where he treated over 500 Division I athletes and served as team physician across multiple sports. He has also provided care for elite competitors, including members of the USA Freestyle Ski Team and professional athletes in combat sports.

In addition to his clinical practice, Dr. Taylor has served as an Associate Clinical Professor at California Health Sciences University and as an Adjunct Professor of Osteopathic Medicine at Campbell University, where he has been recognized for mentoring the next generation of physicians.

Passionate about education, service, and innovation in musculoskeletal care, Dr. Taylor continues to advance regenerative medicine while enjoying family time, outdoor adventures, and DIY projects in his spare time.

Timothy Mazzola, MD, is triple board-certified in family medicine, sports medicine, and musculoskeletal ultrasound. He practices as a non-operative orthopedic and regenerative medicine specialist at Breakthrough Regenerative Orthopedics in Boulder, Colorado. His enduring professional passion is to bring restoration, healing, and hope to those looking to return to the life they love and be the people they are called to be.  

Dr. Mazzola formerly worked as a non-operative orthopedic specialist at Cornerstone Orthopedics for eight years and was a United States Air Force Academy team physician. 

Passionate about teaching, Dr. Mazzola is an assistant clinical professor at the University of Colorado in Boulder, teaching family medicine residents. He is a national expert and highly sought-after physician educator who has taught musculoskeletal and sports ultrasound for many years at the Gulfcoast Ultrasound Institute and Advanced US courses at the American Medical Society of Sports Medicine National Conferences.

As a leader in the field, he recently co-authored a chapter on using ultrasound-guided techniques in regenerative medicine procedures in one of the first textbooks on regenerative orthopedics, titled "Regenerative Treatments in Sports and Orthopedic Medicine," edited by Drs. Malanga and Ibrahim. 

Apart from his passion for bringing restoration and healing to those God sends his way, he is blessed to have recently celebrated 25 years of marriage to his heroic and amazingly compassionate bride. They have been blessed with two amazing sons, each gifted with strength, kindness, brilliance, and leadership. 

In his free time, you may find Dr. Mazzola cranking his bike up a trail, flowing down a mountain through powder, or, if he's lucky, riding great waves with good friends.

I believe I'm here to help you make an informed decision about your heath. It's not my job to tell patients what to do but to empower patients to make healthy decisions for themselves. Nonjudgemental, thorough, holistic and evidence-based, I look at every angle to provide the best options for every patient.

Jodie Gahn-Stahley began her health-care career in 1990 as a US Fleet Marine Force Corpsman where she treated Navy and Marine Corps personnel and their families at Camp Pendleton, CA and Naval Medical Center San Diego, CA. After four years, she separated from active duty and continued her military career in the US Naval Reserves supporting Fleet Hospital 23, Field Medical Unit as a combat medical technician. 

Jodie grew up in southeastern Wisconsin and attended the University of Wisconsin- Madison for undergraduate training in 1995. While pursuing her degree, she worked as a multi-specialty medical assistant at Dean Medical Center in Madison, Wisconsin. Her physician assistant training was completed at College of Osteopathic Medicine - Des Moines University. Since then, she has been dedicated to providing quality and cost- effective health care in the South Denver Metro area. Her outpatient medical practice spans the pediatric through geriatric 

population with a focus on preventative medicine, disease management and urgent care. 

In her personal time, she and her husband, John, enjoy a multitude of outdoor adventures whether hiking in the forest or boating and fishing in Colorado's mountain lakes and streams with their two dogs Max and Elke. An aspiring home chef and foodie, Jodie is known to whip up a tasty meal for her family and friends. 

Douglas Hallmark, MD, is an experienced and highly respected family medicine practitioner at Douglas Family Medicine who is delighted to be serving the population of Castle Rock, Colorado, and the surrounding areas.

Dr. Hallmark grew up in Colorado, graduating from Arapahoe High School in Centennial in 1970. He graduated magna cum laude with a degree in Chemistry from Baylor University in Waco, Texas, then pursued his medical degree at the University of Texas Medical Branch (UTMB) in Galveston. Dr. Hallmark graduated from UTMB in 1979 and practiced in East Texas for the next 10 years.

Dr. Hallmark’s life-long desire was to be a small-town family doctor who not only served his patients but developed close relationships with them. He has achieved this goal in his practice of medicine in Castle Rock for the past 20 years, providing exceptional medical care that recognizes the importance of treating every patient as a unique individual. By combining his considerable experience of primary care with the latest advancements in medicine, Dr. Hallmark is able to offer residents of Castle Rock the most up-to-date treatments available with the personal touch of hometown care.

Dr. Hallmark and his wife, Marie, have been married for over 30 years and have six children and one grandson.

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.

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.

Education

Medical School: Loyola University Stritch School of Medicine – Chicago, IL

Internship

Internal Medicine: Exempla St. Joseph Hospital – Denver, CO

Residency

Diagnostic Radiology: University of Colorado – Aurora, CO

Fellowship

Interventional Radiology: Medical College of Wisconsin – Milwaukee, WI

Board Certification

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:

• Gipson MG, Smith, MT, Durham JD, Brown A, Johnson T, Ray CE Jr, Gupta RK, Kondo KL, Rochon PJ, Ryu RK. Intravascular US-Guided Portal Vein Access: Improved Procedural Metrics during TIPS Creation. Journal of Vascular and Interventional Radiology, 2016 Aug; 27(8):1140-7. PMID: 26852944
• Charles E Ray, Anthony C Brown, Tyler J Green, Helena Winston, Sara M Kreidler, Deborah H Glueck, Paul J Rochon. Survival outcomes in patients with advanced hepatocellular carcinoma treated with drug-eluting bead chemoembolization. American Journal of Roentgenology. 2015; 204: 440-447. PMID: 25615768
• Brown A, Malden E, Kugelmas M, Kortz E. Diagnosis of pancreatic duct-portal vein fistula; a case report and review of the literature. Journal of Radiology Case Reports. 2014 March; 8(3):31-38. PMID: 24967026

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.

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.

David R Zimmermann, is Colorado Recovery Solutions Chief Operating Officer (COO). He leads the Operations Team at Colorado Recovery Solutions in Colorado Springs, Colorado, to assist patients improve their mental health, provide alternatives to treatment resistant conditions, and give patients a different and more holistic pathway to life-changing treatments.

David graduated from the University of Colorado - Colorado Springs with a Bachelor of Science in Biology. He also has two Associates Degrees in General Studies from Pikes Peak State College and in Applied Science for Allied Health / Practical Nursing from the Community College of the Air Force.  He is also a Veteran that served as an active-duty Air Force Medic in several different assignments. His specialties were Family Health as an Aerospace Medical Technician and Flight Medicine as a Flight and Operational Medical Technician. He worked closely in face-to-face patient care, clinical operations, headquarters medical management working groups and as a proficient first-responder out-in-the-field. He has also worked as an Emergency Medical Technician, Fire Fighter, Security and Parking Operations for different companies. His next goal is to get his Masters in Nursing with a specialty focus in Psychiatry.

His love for family, friends, nature, faith, science and his subjective life experiences have also inspired him to pursue a career in Advanced Clinical Psychiatry. He deeply relates to those suffering from all forms of mental health conditions and portrays a compassionate and empathetic care to finding a long-lasting or permanent healing.

He is a fluent Bilingual Spanish speaker, who is very proud to come from Central America. His other passion in the medical realm is to assist those that only speak Spanish or that speak very little English, to understand the full scope of their conditions and plan of care. As an immigrant himself, he personally witnessed the lack of resources and dire need in our immigrant communities, and wants to make an impact in where those services and resources are needed the most.

He loves caring for others and treating everyone with respect, dignity, humility and confidence. He is very happy to be leading the Operations Team at CRS and to harvest a community of empathetic professionals that are spearheading the way in our modern Mental Health Crisis with edge-cutting treatments and techniques.

Dr. Analice Hoffenberg, or Dr. Ana, as she is usually tenderly called by her patients, is the Medical Director at Your Wellness Journey Center. She is Board-Certified in both Clinical General Preventive Medicine and Addiction Medicine. Dr. Hoffenberg is from Rio de Janeiro, Brazil, and speaks fluently Portuguese, Spanish and English. She graduated from Medical School at the Universidade Estadual do Rio de Janeiro, and had clinical training in Pediatrics, General Clinical Preventive Medicine and Addiction Medicine, and completed a Master in Science of Public Health, all at the University of Colorado. Dr. Ana is clinical faculty at the University of Colorado School of Medicine, where she has acquired, over decades of practice, along with years of work in the private sector, extensive experience treating addicted patients with comorbid psychiatric conditions. She is excited to now open Your Wellness Journey Center, extending her tender loving care to her new patients here.