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Sees Patients At: Baltimore, Frederick, Pikesville, and Westminster, MD

Kristian Ulloa, MD, FACS, is a vascular surgeon at Vascular Surgery Associates, LLC. He provides comprehensive and individualized care to patients in Baltimore, Frederick, Pikesville, and Westminster, Maryland.

Dr. Ulloa joined the team at Vascular Surgery Associates in 2011. After earning his undergraduate degree from Emory University in Atlanta, Georgia, he returned to his home state of New Jersey, where he completed his medical school training at Rutgers Biomedical and Health Sciences (formerly the University of Medicine and Dentistry of New Jersey) in Newark. 

He then moved to Maryland to complete his general surgery residency and vascular fellowship at the University of Maryland Medical Center in Baltimore. During his training, Dr. Ulloa presented research at multiple national and regional meetings. 

Throughout his career, Dr. Ulloa has also authored chapters in vascular surgery texts on endovascular treatment of venous disease as well as the management of peripheral aneurysms.

Dr. Ulloa has been recognized for his achievements and was awarded a Top Doc Award in 2017 and 2020 by Baltimore magazine.

Sees Patients At: Pikesville, Towson-SJMC, and Westminster, MD

Tammer Elmarsafi, DPM, is a fellowship-trained podiatric surgeon at Vascular Surgery Associates, LLC, in Pikesville, Towson-SJMC, and Westminster, Maryland.

Dr. Elmarsafi completed his medical school training at the New York College of Podiatric Medicine in 2016. After completing his residency training at MedStar Washington Hospital Center, a Level 1 trauma center, he went on to complete his fellowship at Georgetown University Hospital, which afforded him the title of Assistant Professor at the Georgetown School of Medicine Department of Plastic Surgery. 

Dr. Elmarsafi specializes in treating all aspects of the foot and ankle. Having specialized training and expertise in complex lower extremity pathologies, he has given many national and international lectures on topics related to vascular and diabetes-related complications. In addition, he has published extensively in peer-reviewed journals and has co-authored several textbooks on a myriad of foot and ankle-specific subjects. 

He is a highly skilled surgeon whose philosophy revolves around caring for all aspects of his patients, not only their lower extremity problems. Dr. Elmarsafi provides care to patients of all age groups, and complexity, and welcomes new patients and second opinions. 

Sees Patients At: Towson-GBMC and Westminster, MD

Carter Freiburg, MD, is a board-certified vascular surgeon serving patients in Towson-GBMC and Westminster, Maryland. Dr. Freiburg joined the team at Vascular Surgery Associates, LLC, in 2011. 

He earned his undergraduate degree from Washington University in Saint Louis, followed by a medical degree from the Loyola University Chicago Stritch School of Medicine. Dr. Freiburg completed his general surgery residency at The University of Vermont Health Network (formerly the University of Vermont and Fletcher Allen Health Care) and a vascular surgery fellowship at Yale University in New Haven, Connecticut. 

As part of his training at Yale, he studied complex thoracic and abdominal aortic endovascular surgery at the Royal Prince Alfred Hospital in Sydney, Australia. His practice encompasses all aspects of open vascular and endovascular surgeries.

Dr. Freiburg is currently accepting new patients and looks forward to helping them improve their health. He welcomes them to visit Vascular Surgery Associates, LLC, and schedule an appointment

Sees Patients At: Elkton, Towson-GBMC, and Belair, MD 

Clinton Protack, MD, PhD, is a board-certified vascular surgeon who joined Vascular Surgery Associates, LLC, in 2019. He is proud to provide exceptional care to patients in Baltimore, Ellicott City, Pikesville, Towson-GBMC, and Westminster, Maryland.

He completed his undergraduate work at Lehigh University and received his Doctor of Medicine from the University of Rochester School of Medicine and Dentistry in New York. His surgical residency was completed at Yale-New Haven Hospital in Connecticut. At Yale University, Dr. Protack earned his PhD while investigating AV fistula maturation in the vascular biology and therapeutics program. He then proceeded to complete a vascular surgery fellowship at the Cleveland Clinic Foundation.  

Dr. Protack holds the Registered Provider in Vascular Interpretation (RPVI) certificate and is board certified in surgery.

Dr. Protack is currently accepting new patients and is excited to partner with them in their health care journey. He welcomes them to Vascular Surgery Associates, LLC, and encourages them to schedule an appointment.

Sees Patients At: Bel Air, Pikesville, Elkton, and Towson-GBMC, MD

P. Andrew Rivera, MD, RPVI, is a board-certified vascular Surgeon who joined Vascular Surgery Associates, LLC, in 2022. A Texas native, he completed his undergraduate studies in Music Composition at Baylor University and obtained a Master's degree in Music Composition from the University of North Texas.

Dr. Rivera then received his Medical Doctorate from the University of Texas McGovern Medical School in Houston, Texas and stayed on as a general surgery intern. His surgical residency was completed at the University of Tennessee Health Science Center at Nashville, where he gained experience in general and vascular surgery.

Subsequently, he completed a vascular surgery fellowship at Ochsner Health in New Orleans, Louisiana. There Dr. Rivera gained considerable experience in treating patients with end-stage renal disease, peripheral vascular disease, cerebrovascular disease, and complex aneurysm disease with both open and endovascular techniques.

Dr. Rivera has performed research in outcomes of cerebrovascular interventions using machine learning, and has won the SAVS Founders Award in 2022.

Sees Patients At: Columbia, Ellicott City, Pikesville, and Westminster MD

Yi Zhou, MD, FACS, is a board-certified vascular surgeon at Vascular Surgery Associates, LLC, in Columbia, Ellicott City, and Pikesville, Maryland,. Dr. Zhou aims to provide high-quality and individualized care to his patients.

Born and raised in China, Dr. Zhou moved to the United States to pursue his education. He completed his college education in Kentucky.

Dr. Zhou obtained his medical degree from SUNY Upstate Medical University in Syracuse, New York. Followed by general surgery residency training at Albany Medical Center (Albany Med) in Albany, New York. He then pursued a two-year vascular surgery fellowship at Geisinger Medical Center in Danville, Pennsylvania.

During his residency and fellowship training, Dr. Zhou has given several national and regional presentations on aneurysm disease and mesenteric disease. He has also co-authored multiple clinical papers in the field of vascular surgery. Following his fellowship Dr. Zhou was on staff at the Wellspan Hospital in York, Pennsylvania, for four years.

Dr. Zhou is double board-certified in general surgery and vascular surgery. He is a Fellow of the American College of Surgeons (FACS) and holds a certificate as a Registered Provider in Vascular Interpretation.

Apart from taking care of his patients, Dr. Zhou enjoys classical music and watching motor racing.

Caroline Sanchez, MD, FACS, FASCRS, is a board-certified colon and rectal surgeon at Fairfax Colon & Rectal Surgery, PC.

Dr. Sanchez knew she wanted to be a doctor from the time she was a little girl. She was born and raised in Northern Virginia and attended the renowned Thomas Jefferson High School for Science and Technology in Alexandria.

During high school, Dr. Sanchez spent summers working in a laboratory at the Walter Reed Army Institute of Research in Silver Spring, Maryland. That experience enabled her to enroll in medical school directly after graduation as part of a combined seven-year BA/MD program at George Washington University in Washington, District of Columbia. 

Dr. Sanchez thrived in the program, earning her Bachelor of Science in biology and graduating magna cum laude. Afterward, Dr. Sanchez remained at George Washington University, earning her Doctor of Medicine with distinction in 2004.

Before joining the team at Fairfax Colon & Rectal Surgery, PC, Dr. Sanchez completed a general surgery residency at George Washington University, and a fellowship in colon and rectal surgery, at Robert Wood Johnson Medical School in New Brunswick, New Jersey.  

Dr. Sanchez proudly holds membership in several professional organizations, including the Chesapeake Colorectal Society, the American Society of Colon & Rectal Surgeons, and the American College of Surgeons. Professionally, Dr. Sanchez has special interests in minimally invasive procedures and new technologies.

When she isn’t meeting with patients or contributing to medical journals, Dr. Sanchez enjoys traveling and spending time with her husband and two children.

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.