Active in various professional organizations, Dr. Klassen is a Fellow of the American Academy of Orthopaedic Surgery (2000) as well as being a member of the Arthroscopy Association of North America; Consultant and Reviewer of the Journal of Bone & Joint Surgery for sports medicine; Member of the Board of Directors (2006 to present) with the California Orthopaedic Association and served on the Board of Councilors of the American Academy of Orthopaedic Surgery; and Member of the Inman Abbott Society. Dr. Klassen is an Associate Master Instructor for shoulder and knee arthroscopy and teaches in the learning center in Chicago, IL.