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Availability last updated 06/22/2026
John Tillou, MD, is a board-certified colon and rectal surgeon at Fairfax Colon & Rectal Surgery, PC. He has wanted to be a surgeon since undergoing an operation in high school.
A native of Norfolk, Virginia, Dr. Tillou received his Bachelor of Science in Chemistry at the University of Utah in Salt Lake City, Utah, where he made the Dean’s List, coached high school baseball, worked in a pathology lab, and volunteered at a free medical clinic.
During his undergraduate studies, he earned the Bioscience Undergraduate Research Mini-grant and received the Comprehensive Chemistry Award and Undergraduate Research Scholar award.
Dr. Tillou eventually returned home to attend medical school at the University of Virginia School of Medicine in Charlottesville, Virginia, where he received the Dr. Graham Clark Scholarship and the Charles & Bernice McKay Scholarship.
After graduation, Dr. Tillou completed his general surgery residency at Beth Israel Deaconess Medical Center, a teaching hospital of Harvard Medical School in Boston, Massachusetts. He completed an additional colorectal surgery fellowship at MedStar Washington Hospital Center in Washington, D.C.
While completing his training, Dr. Tillou co-authored several book chapters and papers. He also received the highest score on the annual colorectal training exam.
Dr. Tillou has undergone advanced training in minimally invasive, robotic, and transanal colon and rectal surgery techniques. He has a particular interest in the treatment and management of colon cancer, anal pain, and anal cancer.
In addition, Dr. Tillou holds many professional affiliations, including the American Society of Colon & Rectal Surgeons, American College of Surgeons, Medical Society of Virginia, and Chesapeake Colorectal Society.
Outside of work, Dr. Tillou enjoys hiking, skiing, playing guitar, and spending time with his family.
John Tillou, MD
Colorectal Surgeon
7051 Heathcote Village Way
Ste 135
Gainesville, VA 20155
Anna Kata, MD, MAS, FASCRS is a board-certified general surgeon and colorectal surgeon-October 2024 and proctologist at Fairfax Colon & Rectal Surgery, PC. She serves patients in and around Fairfax, Gainesville, and Lansdowne, Virginia, operating out of FCRS’s Fairfax - Merrifield, Fairfax – Gainesville/Haymarket, and Lansdowne - Loudoun offices.
Born and raised in northern New Jersey, Dr. Kata recognized her passion for medicine early on while volunteering in the surgical wards of her local hospital. She saw firsthand the impact a thoughtful and well-trained physician could have on the lives of their patients. With this goal in mind, she obtained her Bachelor of Science in Biology at Yale University in New Haven, Connecticut.
After graduation, Dr. Kata moved and enrolled at the University of California, San Francisco’s School of Medicine. There, she cemented her desire to become a surgeon and subsequently completed her surgical training at MedStar Georgetown University Hospital in Washington, DC.
Wanting further expertise, Dr. Kata pursued a Colon and Rectal Surgical Fellowship at Lahey Hospital & Medical Center in Burlington, Massachusetts. Her training included all aspects of anorectal and abdominal surgery and endoscopy.
During her clinical training, Dr. Kata developed an interest in the issues surrounding the care of older adults undergoing surgery. To further study this topic, she obtained a master’s in Clinical Research at her alma mater, the University of California, San Francisco. She has authored several publications and presented her research at national meetings.
When she isn’t at work, Dr. Kata enjoys spending time outdoors with her husband and is an avid backpacker and gardener.
Dr. Anna Kata
Colorectal Surgeon
7051 Heathcote Village Way
Ste 135
Gainesville, VA 20155
Kimberly Matzie, MD, FACS, FASCRS, is a board-certified colon and rectal surgeon at Fairfax Colon & Rectal Surgery, PC.
Dr. Matzie was born and raised in Granby, Connecticut. She decided to pursue a career in medicine after undergoing an operation in her freshman year of college. The procedure went well, but the surgeon didn’t have the best bedside manner, and no one on the surgical team explained the process or what to expect during recovery.
Dr. Matzie left the hospital inspired and committed to making interactions with her patients both positive and informative. After earning her undergraduate degree at Harvard College in Cambridge, Massachusetts, Dr. Matzie enrolled at the Perelman School of Medicine at the University of Pennsylvania in Philadelphia.
There, she earned her Doctor of Medicine before completing a residency in general surgery at Brigham & Women’s Hospital in Boston. While there, Dr. Matzie also completed fellowships in clinical research, surgical care, and critical care.
Before entering private practice, Dr. Matzie completed fellowship training in colon and rectal surgery at Cleveland Clinic Florida in Weston. She received extensive tutelage in advanced laparoscopy for small bowel, colon, and rectal surgeries.
As a colon and rectal surgeon, Dr. Matzie has special interests in Transanal Endoscopic Microsurgery (TEM), a minimally invasive approach to removing large rectal polyps and early cancers not responsive to colonoscopy excision or other traditional techniques.
When she isn’t at work, Dr. Matzie enjoys spending time with her husband, Chris, and their two daughters.
Kimberly Matzie, MD
Colorectal Surgeon
7051 Heathcote Village Way
Ste 135
Gainesville, VA 20155
Rami Makhoul, MD
Surgeon
165 Thomas Johnson Drive
B
Frederick, MD 21702
