Dr. Jansen is board certified by the American Board of Ophthalmology. He is a Fellow of the American Academy of Ophthalmology and is a member of the American Society of Cataract and Refractive Surgery, the American Medical Association, the Missouri Medical Association, and the Greene County Medical Society. He has served on the board of Southwest Baptist University as well as many local medical advisory boards. He is a member of the clinical faculty of Cox Family Practice Residency and other area medical and optometry schools.