Mary Corey, D.V.M and Owner of Stream Valley 

Dr. Mary Corey is native to Northern Virginia and grew up inside the Beltway. She attended Whittier Junior High, and later graduated from Falls Church High School in 1977. Her father and mother come from a great generation—her mother was a farm girl daughter of a teacher and later met her father, Col. Corey, who were both animal and outdoor lovers. Her sister and brother are both pet owners, with her sister working in finance and her brother working at an engineering firm. Her childhood buddies always included dogs, cats, horses, and a variety of other four-legged critters, large and small, yet some had more legs and others no legs at all. Animals have always been in the family. As a result, she was naturally curious and driven to help and heal her critter companions!

Our aspiring doctor went onto Blacksburg where she attended Virginia Polytechnic Institute and graduated cum laude with Bachelor of Science in Biochemistry and a minor in animal science. She then moved next door to attend the Virginia-Maryland Regional College of Veterinary Medicine, completing her training in 1988 to achieve the title of Doctor of Veterinary Medicine.

Dr. Corey went on to practice veterinary medicine among the teams of Shrewsbury and Toms River veterinary hospitals in New Jersey through mid-1998. When she returned to Northern Virginia, Doctor Corey spent the following two and a half years as a clinician in emergency medicine at the Regional Veterinary Referral Center in Springfield, where she fostered her aspiration to open a unique practice. During the end of her tenure as an ER clinician and with the encouragement of the referral center, she constructed her dream. In 2000, she purchased an old farmhouse with 1 acre of land, making her dream of opening Stream Valley Veterinary Hospital a reality. To this day, Stream Valley remains with the promise of hometown hospitality and the best care for all pets that come to visit.

Dr. Amantha Johnson, D.V.M.

Dr. Amantha Johnson, a local of Sterling Park, was one of Stream Valley's first Licensed Veterinary Technicians in the opening years of 2001-2004. She then moved to Blacksburg and continued to work as an LVT in the "Hokie Hills" in pursuit of her lifelong dream to add DVM (Doctor of Veterinary Medicine) behind her name. She was later accepted into Ross University School of Veterinary Medicine in 2015 in the Caribbean Islands. Her last and clinical year was finished at the VA-MD College of Veterinary Medicine, back in Blacksburg. When asked why she has chosen to return to Stream Valley, her reply is two-fold. "I know some of the clients (can't wait to meet more!), and Dr. Corey is a good teacher," she said.

Dr. Johnson has many pets of her own! She has a miniature pinscher, which she bottle fed from birth, and a senior chihuahua that she adopted as a rescue. She also has three birds and a snake! In her spare time, she enjoys painting and playing tennis. Her special interests in the veterinary field include exotics, surgery, and ophthalmology.

Dr. Corey is proud to have Dr. Johnson back on Stream Valley's staff! Dr. Johnson has been in the veterinary field for 20 years and has an undeniable love and devotion to the human-animal bond. Welcome back, Dr. Johnson!

Dr. Sam is originally from India, where he developed a love for caring for animals! In India, he received his Bachelor of Veterinary Medicine and Surgery degree, and worked mostly with large animals for over 8 years before coming to the United States in 2008. In 2011, Dr. Sam received his Master's Degree in Molecular Avian Biology from the University of Delaware. Upon completion of his Master's he went on to complete the certification program for the Educational Commission for Foreign Veterinary Graduates (ECFVG). He later passed the North American Veterinary Licensing Examination (NAVLE) in 2015, which is a requirement for licensure to practice veterinary medicine in the U.S. and Canada. Dr. Sam has been living in Virginia since 2015, and joined Stream Valley in February of 2019! 

Dr. Syamsundar Gaddamanugu, D.V.M.

Dr. Sam has a strong interest in both surgery and diagnostic imaging, and he is experienced in soft-tissue and bone surgical procedures. Outside of work, he enjoys painting and gardening. His wife is an IT consultant, and together they have two children, ages 8 and 4. In the future, Dr. Sam hopes to receive board certification in surgery/lab animal medicine. 


We are excited to welcome Dr. Sam into the Stream Valley family! 

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7:00 AM - 7:00 PM

Monday - Friday

8:00 AM - 3:00 PM


5:00 PM - 7:00 PM

Sunday (boarder pickup only)

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42902 Waxpool Road, Ashburn, VA 20148​

Email: receptionsvvh@gmail.com
Tel:  703-723-1017

© 2021 by Stream Valley Veterinary Hospital.