Clark Switzer dedicated his career to history and education. He taught history at Wyoming Seminary from 1976 to 2021. During that time, he integrated innovative ideas and techniques to engage students in the study of people, places, and moments in time in local and American history. The "living history" curriculum also included local history and current events. Artifacts, clothing, music, games, debates, role-playing simulations, and field trips were used in the study of American history. He also served as the Chair of the Social Studies Department for the middle school and primary divisions at Wyoming Seminary, and has taught as an adjunct professor in the Education Department at Wilkes University.

In northeastern Pennsylvania, Clark is a speaker, collaborator and volunteer. He has lectured at libraries, church groups and other organizations on local history, and has been a presenter at two Luzerne County Community College Local History Conferences. With Wilkes University faculty, he designed Project History, a curriculum to educate area teachers on local history. He volunteers as a tour guide for the Knox Mine, has served on numerous boards including the Luzerne County Historical Society, Anthracite Heritage Foundation, and the Greater Pittston Historical Society. Currently he serves on the board for the Item Temple Restoration Project.

He holds a B.A. in Sociology from King's College, and a M.S. in Guidance Counseling from the University of Scranton. He is the author of Scratching the Surface, an online textbook centering on Wyoming Valley history. A video component is available to accompany the textbook.