Medical Strategic Network



Bob Mason, MDiv

Executive Director, Redlands, CA

As Executive Director of Medical Strategic Network, Bob gives overall leadership to the organization. He has served with Cru / Campus Crusade for Christ for 33 years. His assignments include campus staff at Oklahoma State University, coordinating evangelistic outreaches worldwide, and directing campus staff teams. He is the founder of the Whole Person Care Preceptorship and the Pre-Med / Pre Pro Health Student Project and serves on the teaching faculty of METS Conferences. He is married to Diana. They have two adult children. The Masons reside in Southern California.

Diana Mason

Field Staff, Redlands, CA

Diana has served in missions overseas in Japan and the former Soviet Union. Since 1989, she has served with Cru / Campus Crusade for Christ as a trainer and field staff. For the last 16 years her focus has been on healthcare students and professionals. Diana is married to Bob and they have two children who she homeschooled until high school.

Scott Tirrell

Accountant, San Bernardino, CA

Scott has served as the ministry’s accountant for the past six years. He is also the chief financial officer of Mastermedia International. Prior to that, Scott and his wife served with Cru / Campus Crusade for Christ for 26 years, where among other positions, he served as the controller of the International School of Theology.

Evelyn Flygare, MA (ret)

Emeritus Field Staff, Crestline, CA

Prior to retiring in 2018, Evelyn served with Campus Crusade for Christ / Cru since 1973 focusing on evangelism, discipleship and training. Her heart is to build and equip workers for the Lord’s harvest who will serve in the fields of healthcare. She is married to Bruce, a finish carpenter.