Dr. Kossel has been involved with church ministries either full time or part time for over 40 years. He has worked with missionaries and churches worldwide and has helped develop a couple of Bible institutes, mission programs, businesses and has produced a number of Bible Institute syllabuses, Sunday School materials and various leadership training materials and resources. He currently has a tax preparation and consulting business specializing in nonprofit issues. He has used his businesses over the years to help support his ministry work.