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Our Founder
Dr. Thomas B. Ducker, Partner Emeritus

Thomas Barbee Ducker was born in Huntington, West Virginia in 1937. After completing his basic education in the public schools there, he entered the University of Virginia. In 1970, Dr. Ducker and his family moved to Charleston, South Carolina where he became Assistant Professor at the Medical University of South Carolina. He spent 5 years there, with continuing research support and serving as an Assistant Dean to the College of Medicine.

In 1975, he assumed the responsibilities of Professor and Head of Neurosurgery at the University of Maryland. The position soon expanded to include the Director of the Neurotrauma Program for the Maryland Emergency Medical Service Systems. As the Program Director at the University of Maryland, he continued his active teaching and research interest, as well as assuming increased clinical obligations. His research during this period concentrated on stroke and trauma with special interest in emergency problems. During his tenure at Maryland (1975-1983), fourteen residents completed training, passed their boards and entered either private practice or academic neurosurgery.

In 1984, Dr. Ducker moved his primary office to Annapolis, Maryland, where he began what would become Maryland Brain and Spine. In 1985 he became Professor of Neurosurgery at the Johns Hopkins Medical School. He has been editor of several textbooks and continues to be editor for the Journal of Spinal Disorders.

His bibliography lists over 300 titles and was consistently voted a "Top Doc" by community physicians in both Baltimore Magazine and What's Up Annapolis.

Dr. Ducker retired from the practice in the Spring of 2010 and is enjoying traveling, tennis, golf and will be teaching again at the University of Georgia.


Brian J. Sullivan, M.D., F.A.C.S.

Born and raised in the Washington, D.C. metropolitan area where he had his basic education, Dr. Sullivan obtained his B.S. degree at Dickinson College in Pennsylvania. He then obtained his M.S. in Physiology and Doctor of Medicine at Georgetown University. His neurosurgery residency was completed at the George Washington University Medical Center. Dr. Sullivan passed his certifying boards in 2003.

In addition to general neurosurgery, Dr. Sullivan has been trained in the sub specialized field of skull base neurosurgery (including pituitary tumors) and has extensive experience in the use of neuronavigational instrumentation such as the Vector Vision system. Dr. Sullivan has been chosen to conduct FDA trials for the Bryan Disc Prosthesis, a surgical alternative to cervical spine surgery. Dr. Sullivan has spoken extensively on new techniques for spine surgery and has lectured on head injuries in sports and return to play guidelines.


Dr. Sullivan has been practicing at Maryland Brain and Spine since 1999. He has privileges at Anne Arundel Medical Center, Baltimore Washington Medical Center, and Johns Hopkins Hospital. Dr. Sullivan has been listed by community physicians as a "Top Doc" in What's Up Annapolis for the past couple of years.

His wife is a certified Family Nurse Practitioner. They reside in Annapolis with their children.


Timothy G. Burke, M.D.

Born and raised in California, Dr. Burke completed his medical school training, general surgery residency, and neurosurgery residency from the George Washington University in 2001. Prior to that Dr. Burke did his undergraduate studies at Chapman University. Dr. Burke joined Maryland Brain & Spine in 2001. Dr. Burke works with the team at the DeCesaris Cancer Institute at AAMC to use stereotactic radiosurgery (Novalis) to non-invasively treat tumors.

Dr. Burke has a special interest in minimally invasive surgical techniques. Many of the spinal procedures allow patients to walk out of the hospital only hours after the completion of their procedures. He has also undergone extensive training for the treatment of complex brain tumors of the cranial base and pituitary gland. Dr. Burke routinely speaks at regional and national conferences to train other surgeons on innovative and complex surgical techniques. He also serves as a consultant for several surgical equipment manufacturers on innovative new technologies for neurosurgical disorders. He passed the certifying boards in neurosurgery (2006).

He has privileges at Anne Arundel Medical Center and sees patients in our Annapolis and Odenton locations.

He lives in Annapolis with his wife and son.


Gary A. Dix, M.D. , FRCS(C)

Dr. Gary Dix joined Maryland Brain & Spine November 2004. For four years prior to this, Dr. Dix worked in Baltimore, seeing patients at Sinai Hospital, Good Samaritan Spine Center, St. Josephs Medical Center, Maryland General Hospital and Northwest Hospital.

He has extensive experience with complex spine and brain disorders, incorporating the use of the latest minimally invasive procedures, as well as stereotactic radiosurgery to non-invasively treat conditions of the brain and spine. He is also involved in research and teaching and serves as a consultant for several biotechnology companies. Dr. Dix is available in our Annapolis and Bowie locations.

Dr. Dix was born and raised in South Africa where he received his medical degree from the University of Stellenbosch. After completing his internship at Baragwaneth Hospital in Soweto, he immigrated to Canada where he practiced family medicine in northern British Columbia, providing him a unique perspective in helping patients to make decisions about their surgery. In 1993, Dr. Dix entered the neurosurgery residency program at the University of Calgary, Canada and then completed a spine surgery fellowship at Foothills Hospital in Calgary, where he served as staff neurosurgeon for two years. He passed the certifying boards in neurosurgery (2006).

Dr. Dix lives in the area with his wife and three children.


Agostino J. Visioni, M.D., MPH

In August of 2010, Dr. Visioni began his career as a neurosurgeon and joined Maryland Brain and Spine. Prior to that time “Deano” was completing his neurosurgical residency training at The University of Vermont Department of Surgery where he also earned his medical degree. Dr. Visioni did his undergraduate studies at The Johns Hopkins University and earned a Masters in Public Health from Boston University. He is a member of Alpha Omega Alpha Honor Society and has written or co-written numerous articles that have appeared in various neurosurgical publications. He has an interest in all neurosurgical procedures and is trained in the latest invasive and non invasive techniques. Patients can be seen by Dr. Visioni in our Annapolis and Bowie locations and our new office at Southern Maryland General Hospital in Clinton, Md.

Dr.Visioni lives in Annapolis with his wife and three children.






Carol Jerosimich, PA-C

Carol joined Maryland Brain & Spine in 2005 after working eight years as a neurosurgical PA at Maryland General Hospital in Baltimore. Carol completed her Physician Assistant training at Alderson-Broaddus College in West Virginia. She also received her BA from the University of Maryland. Carol started out as an LPN working at North Arundel Hospital in a variety of capacities. She works closely with Dr. Timothy Burke in Annapolis and Odenton.

Carol lives in Anne Arundel County.










Frank Hepfer, Jr., PA-C

Frank joined Maryland Brain & Spine in 2006. Prior to this, Frank was a surgical Physician Assistant specializing in orthopedic and pain management in Southern Maryland. Frank completed his training at Anne Arundel Community College and became certified in 2000. Frank started out his professional career as a respiratory therapist before becoming a Physician Assistant working with Dr. Gary Dix in Annapolis and Bowie.

He and his family live in Queen Anne’s County.









Wendy Riekers, PA-C

Maryland Brain and Spine is very excited about Wendy joining Dr. Sullivan and our practice in August 2012. Prior to coming on board with MBS, Wendy worked as a surgical physician assistant to gynecologic oncology and vascular surgeons in Annapolis and Arizona.

Wendy received her professional certificate as a physician assistant from Essex Community College in 1998 and in 2004, a Masters Degree in Physician Assistant Studies from the University of Nebraska.

With over 10 years of practical experience, Wendy brings a high level of skill to the inpatient hospital setting, the operating room and in our office where she evaluates and treats patients for a variety of spine or brain related illness or injury.   

Wendy and her family live in Annapolis. She is an avid runner and participates in many local charity race events.





Kathryn Watts, MS, CRNP

Kati joined Maryland Brain and Spine in 2010. A native of Annapolis, she earned a Bachelor’s of Science in Biology at University of Maryland College Park, and her MS in Nursing and post-master’s certification as a Family Nurse Practitioner from the University of Maryland School of Nursing.

Prior to and during her NP training, Kati worked as a registered nurse at R. Adams Cowley Shock Trauma Center in Baltimore.

Kati is board certified by the American Academy of Nurse Practitioners. She is a member of the Nurse Practitioner Association of Maryland.

Kati sees patients in our Annapolis office on a full time basis and is available to answer any patient inquiries.

She lives in Severna Park with her husband.






Kerrie L. Sullivan, RN, MSN, CFNP

Kerrie has been a pleasant addition to Maryland Brain and Spine since 2008. Prior to that, Kerrie completed her Bachelor of Science in Nursing at the University of Rhode Island and her M.S.N., Family Nurse Practitioner at The Catholic University of America in Washington, DC.                                   

After completing her studies she worked with orthopedic surgeons and with internal medical physicians in the Annapolis area, giving her a well rounded background in all aspects of our patients’ acute and chronic neurosurgical ailments. 

Kerrie works closely with Brian Sullivan, MD and Wendy Riekers ,PA  in determining the best course of treatment for those patients that come to us in Annapolis and Kent Island.










Maryland Brain & Spine

2002 Medical Parkway, Suite 430

Annapolis, MD 21401

410-266-2720 • fax 410 224 0209

1-877-MDNEURO (1-877-636-3876 toll free)