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Dr. Mark Klaassen, M.D., F.A.C.S.

Orthopedic Surgeon Mark Klaassen learned early on what caring for others is all about. The son of missionaries, he grew up in Colombia where the positive impact of helping others was tightly woven into his character. This childhood experience made him fluent in Spanish. He returned home to the U.S. as a 15-year-old to continue his education, culminating in the MD degree he earned from the Indiana University School of Medicine at Notre Dame and the I.U. Medical Center. He completed his orthopedic surgery residency at Lutheran Hospital of Indiana and is a Fellow of the American College of Surgeons and the American Academy of Orthopaedic Surgeons. Dr. Klaassen is an active member of the American Association of Hip and Knee Surgeons. ​ Throughout his career he has been a mentor to other orthopedic surgeons throughout the U.S. and other countries, providing instruction on advanced orthopedic surgical techniques and procedures – many of which he was instrumental in developing. For example, Dr. Klaassen was a pioneer in advancing the use of the patient’s own autologous platelets to energize the healing process and accelerate recovery following joint replacement surgery. ​ Dr. Klaassen’s areas of specialized expertise include knee, hip and shoulder total joint replacement, and arthroscopic surgery. He currently serves as Professor of Practice in the College of Sciences at the University of Notre Dame. Dr. Klaassen is a consultant and Developer for Biomet, OrthoSensor and Iconacy.

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Dr. Jeff Lawrence, M.D.

Jeffrey M. Lawrence, MD, graduated Magna Cum Laude from Harvard University, where he also played varsity football. He studied medicine at Northwestern University Medical School, served an internship in General Surgery at Loyola University Medical Center (Maywood, IL) and then served a residency in Orthopaedic Surgery at Loyola. He then completed a fellowship at the Anderson Clinic in Joint Arthroplasty – the reconstruction or replacement of arthritic joints. In addition to primary joint replacement surgery, Dr. Lawrence also performs complex reconstructions and revisions of previously replaced joints. He formerly was a clinical instructor in the Department of Orthopaedic Surgery at Loyola University and an attending surgeon at Hines Veterans Administration Hospital in Maywood, IL.

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Dr. Jeffrey Mcintosh, M.D.

Dr. Jeffrey Mcintosh is an orthopedic surgeon in Mount Vernon, IL and is affiliated with multiple hospitals in the area, including Crossroads Community Hospital, Good Samaritan Regional Health Center, and Salem Township Hospital. He received his medical degree from Johns Hopkins University School of Medicine and has been in practice 32 years. He is one of 3 doctors at Crossroads Community Hospital and one of 10 doctors at Good Samaritan Regional Health Center who specialize in Orthopaedic Surgery.

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Dr. Leamon D. Williams, M.D.

Leamon Williams Jr., M.D., a native to Fort Wayne who attended Homestead High School, joined Ortho NorthEast in 2001.  He came to ONE as a Board Certified Orthopaedic Surgeon who practices general orthopaedics in Warsaw, Indiana. Dr. Williams enjoys spending time with his wife Heather and their children. He also enjoys activities such as tennis, golf, skiing, piano, and lake activities.  He is an avid sports fan and enjoys following college football.

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Dr. Brian de Beaubien, M.D.

Dr. de Beaubien has been a board certified orthopaedic surgeon for over 25 years, focused solely on primary and complex revision arthroplasty of the hip and knee. His career interest has been in the specific area of peri-prosthetic joint infection, and in addition to conducting peer-reviewed published clinical research, he holds multiple patents on devises and methods for treatment of this difficult problem. He is founder of a biomedical company currently sponsoring FDA multi-center RCT (randomized controlled trials) seeking approval of an orphan drug combination utilizing antibiotics in an intra-articular fashion for rapid eradication of infection.


Dr. Kevin Kaplan, M.D., F.A.A.O.S.

Dr. Kaplan is the Head Team Physician for the NFL Jacksonville Jaguars and has been a physician with the team for 10 years. He also serves as the Team Physician for the Arena Football League Champion Jacksonville Sharks. Dr. Kaplan is a Team Physician for Jacksonville University, the University of North Florida, and Atlantic Coast high school. He also volunteers as a physician for numerous athletic events hosted in Jacksonville throughout the year.

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