About TOS


Chand Khanna, DVM, PhD, DACVIM Medical Oncology

Dr. Khanna is a graduate of the Western College of Veterinary Medicine in Saskatoon, Saskatchewan, with continued training through a small animal medicine and surgery internship at the Ontario Veterinary College and an internal medicine and oncology residency at the University of Minnesota. He continued his cancer research by completing a PhD in pathobiology at the University of Minnesota, where he studied immunotherapy of metastatic cancers. This was followed by a Senior Postdoctoral Fellowship with the National Cancer Institute, National Institutes of Health in Bethesda, Maryland.

He has practiced veterinary oncology in the greater Washington, DC area for nearly 15 years through his practice, The Oncology Service. As a bridge between his work as a clinician and clinician-scientist, he founded Animal Clinical Investigation, which is a nation-wide network of partners that provides access to novel treatment options for dogs and cats afflicted with complex medical problems. Dr. Khanna serves on the editorial board of the Journal of Veterinary and Comparative Oncology and the Journal of Veterinary Internal Medicine. He has authored over 100 text book chapters and manuscripts in the field of oncology. He is the Chair of the Osteosarcoma Biology Subcommittee of the Children’s Oncology Group and current President of the American College of Veterinary Internal Medicine (Oncology). In addition, he is a founding member of Canine Comparative Oncology and Genomics Consortium.

Dr. Khanna lives in the greater Washington, DC area with his wife, two children, and their dog named Odin. He is also active in the community as a soccer and ice-hockey coach and continue avidly struggling with the game of golf.

Christina Manley, DVM, DACVIM Medical Oncology

Dr. Manley earned her bachelor degree from Bucknell University in Pennsylvania and received her Doctorate of Veterinary Medicine degree from The Ohio State University. She then completed a one-year internship in small animal medicine and surgery at Red Bank Veterinary Hospital in Red Bank, New Jersey. After her internship, she pursued a three-year residency in medical oncology at the Animal Medical Center in New York City. During that time, she was part of the clinical team that conducted studies using immune-based therapies to treat canine melanoma and canine lymphoma. She joined The Oncology Service team in 2009 and primarily see patients at our Leesburg, VA office.

Dr. Manley has experience treating all forms of cancer with a particular professional interest in histiocytic sarcoma and myeloid cancers in dogs and cats. She is also actively involved in clinical research evaluating new therapies for common canine and feline tumors such as lymphoma and mast cell disease.

Angharad Waite, VMD, DACVIM Medical Oncology

Dr. Waite graduated from Princeton University magna cum laude and then attended the University of Pennsylvania Veterinary School obtaining her degree (VMD) in 2008. She stayed on at Penn to complete a rotating small animal internship in medicine and surgery followed by a residency in medical oncology at Cornell University. During the last year of her residency (2012) she received the Small Animal Resident of the Year Award from the fourth year class.

Ira Gordon, DVM, DACVR Radiation Oncology

Dr. Gordon is a native Californian and obtained his veterinary degree from the University of California, Davis. He then completed an internship in small animal medicine and surgery at The Ohio State University. He returned to UC Davis and completed a residency in radiation oncology and is board certified with the American College of Veterinary Radiology in the discipline of radiation oncology. Due to a strong interest in veterinary education and training, Dr. Gordon stayed at UC Davis as an instructor in radiation oncology and founded VetPrep, a company dedicated to providing learning resources to veterinary students that has helped over 35,000 veterinarians prepare for and pass their licensing examination. In 2008, he moved to the Washington, DC area where he initiated advanced training as a postdoctoral fellow in the Radiation Oncology Branch of the National Cancer Institute.

Dr. Gordon's primary clinical interests include the use of advanced imaging and radiation delivery techniques to improve tumor control and patient quality of life. He has a special interest in tumors of the head and neck and in tumors of the central nervous system. His research interests include the identification and investigation of drugs that increase tumor responsiveness to radiation or improve the tolerance of normal tissues to radiotherapy. Dr. Gordon has published primary research and review articles on these subjects and has spoken at national meetings on these topics. He has received multiple awards for his work as a clinician and clinician-scientist, including the George H. Hart Research Grant, Myrtle L. Oliver Memorial Resident Research Award, and the Gerald Ling Award for Small Animal Research. Dr. Gordon lives in Bethesda with his Dalmatian, Jezebel, his wife, Tamara, a reporter for National Public Radio, and their son, Davis.

Pamela White, DVM, DACVR Radiation Oncology

Dr. White obtained her veterinary degree from the Atlantic Veterinary College in Prince Edward Island, Canada. Following veterinary school, she completed a one year internship in small animal medicine and surgery at the Ontario Veterinary College followed by a one year medical oncology Internship. Due to her interest in all aspects of veterinary oncology, she moved to Philadelphia, Pennsylvania in the position of radiation oncology intern at the University of Pennsylvania. Dr. White then completed a residency in radiation oncology at the University of Wisconsin-Madison and is board certified with the American College of Veterinary Radiology in the discipline of radiation oncology.

Dr. White's primary clinical interests include stereotactic radiation therapy, treatment of central nervous system and sinonasal tumors and having a multimodality treatment approach to treating cancer in pets that will provide them with a good quality of life.

She currently lives in the Northern Virginia area with her two cats, Obi and Jabba, who she adopted during veterinary school. Since she is originally from Canada, Dr. White is a huge fan of all things related to hockey.

Tony Rusk, DVM Medical Oncology Hospitalist

Dr. Rusk is a native of southern Indiana, and a graduate of the Purdue University School of Veterinary Medicine. He completed his internship in small animal medicine and surgery at the Friendship Hospital for Animals in June 2000. He was a staff veterinarian at Friendship Hospital for Animals until he joined Dr. Khanna and the Animal Clinical Investigation in January 2001. Within Animal Clinical Investigation, Dr. Rusk serves as Vice President of Clinical Trials and as a clinician have exclusively practiced as Oncology Hospitalist with The Oncology Service since 1999.

Bridget Stewart, VMD Oncology Hospitalist

Dr. Stewart is a graduate of the University of Pennsylvania School of Veterinary Medicine. After completing her VMD, she completed a small animal medical internship with the Veterinary Referral Associates in Maryland. During Dr. Stewart's internship, she completed a study on emergency radiation therapy for dogs with urinary obstruction due to bladder and prostatic tumors. Through this study she discovered her passion for oncology. After working jointly in emergency and oncology in Maryland, Dr. Stewart eventually moved to oncology exclusively. She joined TOS in 2011 initially in our Richmond location. She has had the unique experience of working in all 4 TOS locations but now work primarily in our Springfield clinic.

Dr. Stewart has a special interest in the human-animal bond and as a result, her focus lies in maintaining a high quality of life for her patients. She is married and has 3 kids, an old beautiful mutt and a new dog on the way, plus a handful of fish to keep her busy when she's not at work!

Abbie Speas, DVM, DACVIM Medical Oncology

Dr. Speas attained her Bachelor of Science degree and Doctorate of Veterinary Medicine degree from the University of Georgia. Following veterinary school, she completed a small animal rotating internship at Colorado State University, subsequently returning to Athens, Georgia for a one-year medical oncology internship. Dr. Speas then moved to Gainesville, Florida, where she completed a three-year residency in medical oncology at the University of Florida. During her residency, she worked with an integrated service, including medical, surgical, and radiation oncologists, to provide multimodal therapy for her patients.

Dr. Speas is delighted to be joining The Oncology Service team at the Leesburg, Virginia location. She has a special clinical interest in the treatment of osteosarcoma, histiocytic sarcoma, and lymphoma. She values the importance of client education and working together to determine the best treatment plan for each individual pet.

Currently residing with Dr. Speas are her two cats, Dexter and Elliot, as well as two dogs, Finnegan and Penny. She enjoys exploring the outdoors, attending concerts and festivals, volunteering with Special Olympics, and improving her ballroom dancing skills.

Jeff Alexander, DVM, PhD Radiation Oncology and Advanced Imaging Hospitalist

Dr. Alexander, a native of the Richmond area, received his undergraduate degree from Virginia Tech in 1994 (Biochemistry and Nutrition) and his DVM from VMRCVM in 1998. After seven years in private practice, he continued his training at VCU in addition to completing a Masters of Public Health in 2008. He followed up with a PhD in Biomedical and Veterinary Sciences (Veterinary Medical Informatics) from VMRCVM in 2015. After a two-year fellowship at VCU, Dr. Alexander joined the team at TOS. He has received several awards for his work related to Veterinary Information Systems and Public Health research. Dr. Alexander's clinical interests include adopting and integrating innovative technologies to advance veterinary diagnoses and treatments.

In his spare time, Dr. Alexander enjoys spending time with his wife and 2 year-old, as well as playing goalie for his rec-level ice hockey team. In addition, he is an avid Virginia Tech football and basketball fan. Go Hokies!