Karl has published many articles on engineering education, cooperative learning and structured controversy, knowledge representation and expert systems, and teamwork. He teaches graduate courses on STEM education at the University of Minnesota and engineering education at Purdue, and on project and knowledge management and leadership in the Technological Leadership Institute at the University of Minnesota. He conducts workshops on building engineering education research and innovation capabilities, cooperative learning (especially in STEM disciplines), problem formulation and modeling, and project management and teamwork. He co-designed the Mn/DOT Project Management Academy and the Essential Skills for Project Managers workshops, and has worked with hundreds of engineers and managers at Mn/DOT. His workshops on cooperative learning have helped thousands of faculty build knowledge, skills and confidence for involving their students in more active, interactive, and cooperative learning both during class time and outside of class. The effects of the work are significant in terms of creating a sense of belonging and membership in a community, as well as much more engaged and deep learning. Karl has written eight books including How to model it: Problem solving for the computer age (with Anthony Starfield and Andrew Bleloch), first published by McGraw-Hill in 1990; Cooperative learning: Increasing college faculty instructional productivity (with David and Roger Johnson), published by ASHE-ERIC Reports on Higher Education in 1991; Strategies for energizing large classes: From small groups to learning communities (with James Cooper and Jean MacGregor) published in Jossey-Bass’s New Direction for Teaching and Learning series in 2000; and the 2014 Teamwork and project management, 4rd Ed. published in McGraw-Hill’s BEST Series.