About Us

Joseph F. Chambers M.D.

• Manassas Office

Born and raised in Syracuse, NY, Dr. Chambers attended the University of Notre Dame and obtained a BA in Anthropology. He completed Medical School at SUNY-Syracuse in 1999. His family practice residency was at St. Joseph's Hospital, Syracuse, NY. He joined BRFP in January 2003. Dr. Chambers is married with two daughters and enjoys travel, camping, literature, Native American art and traditional Irish Music.

Gary DeRosa M.D.

• Manassas & South Riding Offices

Born and raised in New York, Dr. DeRosa attended LeMoyne College and obtained a BS in biology. He completed Medical School at Georgetown University in 1979 and his Family Practice Residency at St. Joseph’s Hospital in 1982. After spending time in the public Health Service, he moved to Manassas and opened a practice with Dr. Feldmann. Dr. DeRosa is married with three children. He is an FAA designated Senior Aviation Medical Examiner. He can do 1st, 2nd and 3rd Class Pilot Medicals and also acts as a HIMS program Independent Medical Sponsor. Dr. DeRosa is a commercial pilot & flight instructor. He enjoys working on computers & skiing. Dr. DeRosa is a past president of the Prince William Hospital Medical Staff.

Spencer Feldmann M.D.

• Manassas & South Riding Offices

Born in Cooperstown, NY, and raised in Oneida, NY, Dr. Feldmann received a BS in Biology from St. Lawrence University. He graduated from The SUNY Buffalo School of Medicine in 1977. His Family Practice Residency was performed at St. Joseph's Hospital in 1980. After spending time in the Public Health Service, he moved to Manassas to open practice with Dr. DeRosa. He is married with three children and he enjoys fishing, bicycling and computers. Dr. Feldmann has been the 2000-2002 President of the Prince William Medical staff.

Lynne Flagg M.D.

• Woodbridge Office

Born and raised in Newark, NH, Dr. Flagg is a "Jersey girl." She attended Upsala College in East Orange, NJ and obtained a B.S. in biology. After obtaining her master’s degree from Fordham University in NY, she taught for several years before obtaining her medical degree from UMDNJ New Jersey Medical School. She completed her residency training at the Mountainside Family Practice Program in Verona. After faculty time in public health service in Paterson, she went on to serve as faculty physician at the Virtua Family Practice Residence Program in Voorhees. She recently relocated to Falls Church and will be working at our Woodbridge location. She is married with 3 grown stepchildren. She enjoys outdoor living, golf, music and is an avid reader.

Camille E. Horton M.D.

• Manassas Office

Born and raised in Trinidad and Tobago, Dr. Horton graduated from Rutgers, The State University of New Jersey with a BS in Chemical Engineering. Medical School and Family Practice Residency were completed at the University of Medicine and Dentistry of New Jersey, Robert Wood Johnson. Dr. Horton joined the practice in October 2004. She is married with three children. She enjoys traveling and calypso music.

Robert Latimer Jr. M.D.

• Manassas Office

Born and raised in Manassas, VA, Dr. Latimer is the son of Dr. Robert Latimer Sr., one of the original physicians of the Manassas Medical Center. He received a BA from Wake Forest University and attended Georgetown University for Medical School. He completed his Family Practice Residency at David Grant Hospital/Travis Air Force Base in 1985. Dr. Latimer is married and has three children. He enjoys time with his family, sailing, woodworking, scuba and skiing.

Frederick W. Parker III M.D., M.Ed.

• Manassas Office

Born and raised in Scranton, PA, Dr. Parker graduated from the University of Scranton with a BS in Biology. He attended the George Washington University School of Medicine and completed his residency through the George Washington University Medical Center and the Ohio State University Medical Center. He obtained a Masters in Education in 1991 from Virginia Tech. He has been Chairman of the Education Committee for the Medical Society of Virginia and is the Medical Director of Continuing Medical Education at Prince William Hospital. Dr Parker merged his practice with BRFP in August 1998. He is married with two children and enjoys golfing, running, Civil War history and sports medicine. He serves as one of the team Physicians for George Washington University.

Trupti B. Patel, M.D.

• South Riding Office

Raised in Fairfax, VA, Dr. Patel attended George Mason University and graduated with a BS in Biology and Psychology. She completed her medical school at Eastern Virginia Medical School and her family practice residency at Harrisburg Hospital in Pennsylvania. Dr. Patel was practicing medicine in St. Louis, MO. prior to joining Bull Run Family Practice in August 2004. She is currently a resident of Loudoun County and is working at our South Riding location. Dr. Patel is married with two children. She enjoys traveling, cooking, Redskins football, and spending time with her family.

Michael Perez M.D. M.M.M.

• Manassas & South Riding Offices

Originally from Richmond, VA and raised in Columbus, OH, Dr. Perez graduated from the University of Notre Dame with a BS in Biology. He attended the Medical College of Ohio and completed his residency at Fairfax Family Practice in 1990. His father-in-law is the late Dr. John Ringler, one of the original founders of the Manassas Medical Center. Dr. Perez received his Master's in Medical Management (MMM) from Carnegie Mellon University in 2000. Dr. Perez is now providing Pulsed Light Therapy for the treatment of age spots, other skin pigmentation, vascular lesions, acne rosacea, permanent hair reduction and acne. He is married with four children. He enjoys yoga, tennis, golf, music and coaching soccer.

Frank Ratchford M.D.

• Manassas & Woodbridge Offices

Born in Scranton, PA, and raised in Upstate New York, Dr. Ratchford attended the University of Scranton and received a BS in Biology. After completing his medical degree at SUNY-Syracuse in 1992, Dr. Ratchford performed his residency at St. Joseph's Hospital. He joined BRFP in 1996. Dr. Ratchford is married with two children. He enjoys golfing, jogging, biking, and raising his family.

Scott Ross M.D.

• Manassas Office

Born and raised in Pennsylvania, Dr. Ross received a BS in Biology at Georgetown University. He received his medical degree from Georgetown University and completed his Family Practice Residency at Fairfax Family Practice in 1997. Dr. Ross worked with Dr. Fred Parker in 1997 and joined BRFP in 1998. He is married with two children and enjoys sports, food, critical care medicine, ethics and teaching students. He is the team physician for the Osborne Park High School. Dr. Ross is looking forward to growth in leadership roles in the practice, hospital and community.

Janet Breslin, MSN, FNP-C

• Manassas Office

Born in Washington D.C. and raised in Northern Virginia, Ms. Breslin received her nursing diploma at the Alexandria Hospital School of Nursing. She was awarded a B.S.N. and M.S.N. from Marymount University in 1984and 1988 respectively. She concluded her education with a Post Master’s Certificate as F.N.P in 1995. Ms. Breslin joined BRFP in 1995.She is married with three children and enjoys spending time with family, reading, gardening and riding on her husband’s Harley. She has worked as adjunct faculty at Marymount University for the NP program. Ms. Breslin is a part of the Health/Wellness group at her church.

Rachel Colquitt, R.N., FNP-C

• Manassas Office

Born and raised outside Richmond, Va., Ms. Colquitt received her B.S. in Biology at Bucknell University. She completed a second degree in nursing, B.S.N, at the University of Virginia. She concluded her education with a M.S. and F.N.P from the University of Maryland. Ms. Colquitt worked in a private practice in Burke, Va. before joining BRFP in August 2005. She is married with two daughters and enjoys cooking, traveling, Pilates and exercising, as well as spending time with family and friends.

Elizabeth McMahon, FNP-BC

• Manassas Office

Elizabeth McMahon was born and raised in Northern Virginia, and currently resides in Centreville. She earned her Bachelor of Science degree in Nursing from George Mason University in Fairfax, Virginia in 2002, and began working for a local hospital with a focus on pediatric oncology. Mrs. McMahon decided to pursue her Master of Science degree in nursing from the Catholic University of America with a concentration in Family Practice, completing the degree in 2010. Her nurse practitioner internships were completed in Pediatrics, Geriatrics, Hematology/Oncology, HIV services and Obstetric and Gynecology. She recently celebrated her first year of marriage. In her spare time, she enjoys spending time with her husband, volunteering, reading and visiting local coffee shops.

Bull Run Family Practice Physicians partner with the Prince William Hospitalists for patient care.

When you are admitted to the hospital your Primary Care Physician transfers your care to the Physicians who are experienced in taking care of patients in the Hospital setting. Our Physicians no longer see patients in the hospital.

Who are the Hospitalists and how do they work with your primary care physician?
Prince William Hospitalists are board certified in Internal Medicine and specialize in the care of our adult inpatients. During your stay, the Hospitalist will coordinate all aspects of your care, including consultations with specialists, scheduling tests, ordering medications, and performing procedures. If you are referred by your physician, he or she contacts the Hospitalist and provides all the necessary information about your condition or illness. If you are admitted through the Emergency Department the Hospitalist will communicate with your physician as needed. Throughout your stay and discharge, your Hospitalist will communicate with your primary care physician as necessary and keep him or her informed of your progress.