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Sees Patients At: Baltimore, Pikesville, and Towson-GBMC, MD

Peter Mackrell, MD, FACS, is a board-certified vascular surgeon at Vascular Surgery Associates, LLC, serving patients in Baltimore, Pikesville, and Towson-GBMC, Maryland. Dr. Mackrell joined the practice in 2003. 

He completed his undergraduate work at Princeton University in New Jersey and graduated from Georgetown University School of Medicine in Washington, DC. Dr. Mackrell completed his surgical residency at Weill Cornell Medicine in New York City and vascular surgical fellowship at Greenville Memorial Hospital in South Carolina. During his training, he was the co-investigator of four clinical trials. 

Dr. Mackrell has been voted a “Top Doctor” by Baltimore Magazine eight times, as well as the “Top Doctor” for Vascular Surgery by Castle Connolly for the Washington, DC, Northern Virginia, and Baltimore areas. US News and World Report lists him as one of the “Top Doctors” in the United States. 

He is the Chief, Division of Vascular Surgery at Greater Baltimore Medical Center and Sinai Hospital of Baltimore. He is a member of the Society for Vascular Surgery and is an Assistant Clinical Professor of Surgery at the University of Maryland School of Medicine.

Sees Patients At: Columbia, Ellicott City, and Pikesville, 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.

Sees Patients At: Bel Air and Towson-SJMC, MD and Newark, DE

Andre Biuckians, MD, FACS, is a board-certified vascular surgeon at Vascular Surgery Associates, LLC. He provides a variety of vascular services to patients in Bel Air and Towson-SJMC, Maryland and Newark, Delaware.

Dr. Biuckians joined the team at Vascular Surgery Associates in 2008 and is a graduate of The George Washington University in Washington, DC. He received a Master of Public Health from Boston University in Massachusetts and a Doctor of Medicine from the University of Massachusetts Medical School in Worcester. He completed his surgical residency at Beth Israel Deaconess Medical Center, the teaching hospital of Harvard Medical School, and he pursued a vascular fellowship at Eastern Virginia Medical School in Norfolk. 

Dr. Biuckians has co-authored several publications related to the treatment of deep vein thrombosis and angioplasty for lower extremity claudication. He is a Fellow of the American College of Surgeons and is an Assistant Clinical Professor of Surgery at the University of Maryland School of Medicine. He currently serves as the director of the vascular lab at VSA and the division chief of vascular surgery at the University of Maryland St. Joseph Medical Center.

Sees Patients At: Columbia, Ellicott City, and Towson-GBMC, MD

Michael Osgood, MD, is a board-certified vascular surgeon at Vascular Surgery Associates, LLC, serving patients living in Columbia, Ellicott City, and Towson-GBMC, Maryland. Dr. Osgood joined the practice in 2017. 

Dr. Osgood completed his undergraduate work at Davidson College in North Carolina, and he received his Doctor of Medicine from Emory University in Atlanta, Georgia. He completed his surgical residency at Vanderbilt University Medical Center in Nashville, Tennessee, where he also completed a research fellowship in vascular surgery. He then completed a vascular surgery fellowship at The Johns Hopkins Hospital in Baltimore, Maryland. During his residency and fellowship, Dr. Osgood presented research in several national and regional meetings. 

Throughout his career, Dr. Osgood has authored multiple journal articles and book chapters on diverse subjects, including the endovascular treatment of abdominal aortic aneurysms, venous reconstruction in oncologic surgery, and endovascular carotid artery intervention. In addition, he holds the Registered Provider in Vascular Interpretation (RPVI) certificate.

Sees Patients At: Bel Air, 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, and Pikesville, 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.

Sees Patients At: Bel Air, 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: 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: Columbia, Ellicott City, and Towson-GBMC, MD

Michael Osgood, MD, is a board-certified vascular surgeon at Vascular Surgery Associates, LLC, serving patients living in Columbia, Ellicott City, and Towson-GBMC, Maryland. Dr. Osgood joined the practice in 2017. 

Dr. Osgood completed his undergraduate work at Davidson College in North Carolina, and he received his Doctor of Medicine from Emory University in Atlanta, Georgia. He completed his surgical residency at Vanderbilt University Medical Center in Nashville, Tennessee, where he also completed a research fellowship in vascular surgery. He then completed a vascular surgery fellowship at The Johns Hopkins Hospital in Baltimore, Maryland. During his residency and fellowship, Dr. Osgood presented research in several national and regional meetings. 

Throughout his career, Dr. Osgood has authored multiple journal articles and book chapters on diverse subjects, including the endovascular treatment of abdominal aortic aneurysms, venous reconstruction in oncologic surgery, and endovascular carotid artery intervention. In addition, he holds the Registered Provider in Vascular Interpretation (RPVI) certificate.

 Sees Patients At: Bel Air, Elkton, and Towson-SJMC, MD and Newark, DE

Donald Hahn, MD, is a board-certified vascular surgeon who joined Vascular Surgery Associates, LLC, in 2019. He provides a wide range of vascular services to patients in Bel Air, Elkton,  and Towson-SJMC, Maryland and Newark, Delaware.

A Baltimore native, Dr. Hahn completed his undergraduate degree in microbiology at the University of Maryland, College Park, before obtaining his medical degree from the West Virginia University School of Medicine in Morgantown. He completed his general surgery residency at Union Memorial Hospital in Baltimore, followed by two years of a vascular surgery fellowship at Carolinas Medical Center in Charlotte, North Carolina. 

Dr. Hahn has given several national presentations on complex aortic and carotid artery disease. In addition to his vascular surgery specialization, Dr. Hahn is board certified in general surgery and holds a certificate as a Registered Provider in Vascular Interpretation. He is thrilled to return to his hometown and provide excellent care in all aspects of vascular surgery to the people and community with whom he grew up.

Sees Patients At: Bel Air

Founder and managing partner Roger Schneider, MD, FACS, is a vascular surgeon at Vascular Surgery Associates, LLC. He is dedicated to providing a wide range of vascular services to patients living in and around Bel Air, Maryland.

Dr. Schneider attended medical school at Case Western Reserve University in Cleveland, Ohio. Upon graduating, he completed his internship, residency, and surgical fellowship at The Johns Hopkins Hospital in Baltimore, Maryland, and he served on the teaching faculty there for many years. He was also the former Chief of Surgery at Fallston General Hospital. He is also a Fellow of the American College of Surgeons.

In addition to practicing medicine, Dr. Schneider is a Clinical Professor at the University of Maryland School of Medicine and has authored multiple articles in the field of vascular disease. He is a member of the Board of Directors of the University of Maryland Medical System and currently serves as the Chairman of the Board of the Upper Chesapeake Health System. 

Sees Patients At: Bel Air, Elkton, and Towson-SJMC, MD and Newark, DE 

Micah Girotti, MD, FSVS, is a board-certified vascular surgeon who joined the team at Vascular Surgery Associates, LLC, in July 2017. He is dedicated to providing personalized, high-quality care to patients in Bel Air, Elkton, and Towson, Maryland and Newark, Delaware.

Dr. Girotti was born and raised in southeastern Virginia and attended college in South Carolina. He returned to Virginia for medical school and obtained his medical degree from the University of Virginia in Charlottesville in 2008. He then underwent a general surgery residency at the University of Michigan in Ann Arbor, and during that time, he also completed a master’s degree in health and health care research and published original research about the quality of surgical care and hospital readmissions in vascular surgery. 

He completed his seven years of general surgery training and then went to Northwestern University in Chicago, Illinois, where he completed a two-year vascular surgery fellowship, specializing in all aspects of open and endovascular surgery. During his training, Dr. Girotti was recognized by medical students, residents, and faculty with multiple teaching awards. 

He looks forward to serving each and every patient at Vascular Surgery Associates with personalized medical and surgical care, customized to that individual.

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: Bel Air and Towson-SJMC, MD and Newark, DE

Andre Biuckians, MD, FACS, is a board-certified vascular surgeon at Vascular Surgery Associates, LLC. He provides a variety of vascular services to patients in Bel Air and Towson-SJMC, Maryland and Newark, Delaware.

Dr. Biuckians joined the team at Vascular Surgery Associates in 2008 and is a graduate of The George Washington University in Washington, DC. He received a Master of Public Health from Boston University in Massachusetts and a Doctor of Medicine from the University of Massachusetts Medical School in Worcester. He completed his surgical residency at Beth Israel Deaconess Medical Center, the teaching hospital of Harvard Medical School, and he pursued a vascular fellowship at Eastern Virginia Medical School in Norfolk. 

Dr. Biuckians has co-authored several publications related to the treatment of deep vein thrombosis and angioplasty for lower extremity claudication. He is a Fellow of the American College of Surgeons and is an Assistant Clinical Professor of Surgery at the University of Maryland School of Medicine. He currently serves as the director of the vascular lab at VSA and the division chief of vascular surgery at the University of Maryland St. Joseph Medical Center.