Dr. Mary Beth Moenssen maintains a private orthodontic practice in Dexter, Michigan. She completed a Bachelor of Science in Psychology at the University of Michigan in 1990. She then enrolled in the University of Michigan School of Dentistry, receiving a D.D.S. degree in 1995. She immediately went on to graduate studies in the Department of Orthodontics and Pediatric Dentistry. Dr. Moenssen received an M.S. in orthodontics in 1998.

Dr. Moenssen's primary teaching responsibility is in the Undergraduate Orthodontic Clinic. She lives in Dexter, Michigan with her husband, Rob Marshke. Her interests include running (she has completed several marathons), playing the piano, and spending time with her cat and parrot, who serve as her children for now.