Rita E. Thieme, MD, FAAP

Dr. Thieme is a Board Certified Pediatrician who has been with Castle Rock Pediatrics for 16 years. She received her MD in 1989 from the University of Colorado, followed by her residency in Pediatrics at The Children’s Hospital in Denver. Dr. Thieme also had two years of specialty training in Pediatric Nephrology (Kidney Disease). Following her fellowship, Dr. Thieme worked as a Pediatric Emergency Physician at Swedish Medical Center prior to joining Castle Rock BC9_RitaPediatrics in 1998.  Dr. Thieme is board-certified by the American Board of Pediatrics and is also a fellow of the American Academy of Pediatrics. She has been selected as one of America’s Top Pediatricians by the Consumers’ Research Council of America. Dr. Thieme was Vice-Chairman of Pediatrics at Sky Ridge Medical Center from 2003 – 2005. With her strong interest in the current health care crisis in this country she serves as a delegate for the Colorado Medical Society.

Dr. Thieme’s interests include infants and children of all ages, children with underlying illness, such as heart disease, asthma, kidney disease, congenital defects, premature infants, multiples and children with special needs.

During her free time, Dr. Thieme enjoys spending time with her son, who is a junior at the University of Southern California. She also enjoys bicycle-riding, cooking and gardening.

C. Rashaan Ford, MD, FAAP

Dr. Ford is a Board Certified Pediatrician who joined Castle Rock Pediatrics in October 2013. He was born in Indiana but has been proud to call Colorado his home since the late 90’s. He obtained his undergraduate degree in 2001 from Washington University in St. Louis, MO. He graduated from the University of Colorado Denver School of Medicine in 2007, where he was honored with a Commitment to Diversity Award. Dr. Ford then completed his residency training in Pediatrics at Children’s Medical Center of Dayton and Wright State University in Ohio before returning to Colorado in 2010 to complete a three year fellowship training at Children’s Hospital Colorado in the pediatric subspecialty of Child Abuse and Neglect. Dr. Ford is board certified by the American Board of Pediatrics, a fellow of the American Academy of Pediatrics, and serves as clinical faculty for the University of Colorado Denver School of Medicine.

Dr. Ford enjoys taking care of and advocating for children of all ages with a diverse spectrum of healthcare problems, and his additional interests include childhood safety and injury prevention.

In his spare time, Dr. Ford enjoys spending time with family and friends and exploring the outdoors. He is also a long time member of and musician with the Denver Concert Band.

Stacy J. Ostapko, MD, FAAP

Dr. Ostapko graduated from SUNY Upstate Medical University in 2000. She completed her Pediatrics residency in 2003 from Eastern Virginia Medical School in Norfolk, VA, at the Children’s Hospital of the King’s Daughters. She joined the faculty at the medical school following graduation and became involved in the following aspects of pediatric care: children’s emergency care, attending high risk deliveries, inpatient nursery care, and providing gynecological care to inpatient psychiatric patients. In 2005 she joined an outpatient pediatric practice where sheOstapko remained until 2010. After marrying, she relocated to Georgia and practiced as a hospitalist and faculty member of the Pediatrics Department at Mercer Medical School in The  Children’s Hospital of Central Georgia. She moved to Colorado in 2013 and joined the pediatric practice here at Castle Rock Pediatrics in 2015.
Dr. Ostapko’s interest in pediatrics include newborn care through adolescence, especially gynecological care, ADHD, eczema, and asthma.
Dr. Ostapko’s interests outside the office include spending time with her husband, two children and one cat, gardening, dancing, horseback riding and exploring this wild and beautiful state.

Randal E. Williams, PA-C

Randy was born and raised in Colorado and attended Smoky Hill High School.  He then attended Kansas Wesleyan University where he studied Biology and played football for the “Coyotes.”  Randy returned home to Colorado and attended the Child Health Associate Physician Assistant Program at the University of Colorado Medical Campus where he earned his Physician Assistant Certification in June of 2000.

He currently resides in Castle Rock and has worked at Castle Rock Pediatrics since June of 2012. Randy is also a member of the Pediatric Child Fatality Prevention Team here in Colorado.  His clinical interests include pediatric preventative medicine, pediatric sports medicine, pediatric orthopedics, and pediatric dermatology.  Randy also enjoys teaching PA/medical students in the clinic.

Randy enjoys working out at the gym, playing sports, going camping, and riding his Harley Davidson Motorcycle.