Mike Chupp, MD
Dr. Chupp has served as the CEO of CMDA since 2019.  He is a general surgeon and served at Tenwek Hospital in Kenya from 1996-2016 where he was medical director starting in 1997.  He returned to the US in 2016 to work at CMDA.  Mike is married to Pam, his high school sweetheart, and they have four wonderful children.

Doug Lindberg, MD
Doug serves as the director for CMDA’s Center for healthcare missions and will be your cohost for the Pre-Field conference. He and his wife Ruth are both family physicians who served in Nepal from 2009-2013, where Doug was the medical director at HDCS TEAM Hospital Dadeldhura. They now reside outside Milwaukee and both practice part-time. They have two children, ages 11 and 14. Doug is passionate about helping mobilize, support, and encourage healthcare missionaries, and considers this conference one of the highlights of the year.

Jim Ritchie, MD
Dr. Ritchie served 25 years in the U.S. Navy.  He was emergency medicine residency director, and deployed twice to busy combat support roles in Afghanistan.  In Afghanistan, he developed an interest in combat medicine ethics and moral injury, and later taught widely on the subject.  Upon retiring as a captain from the Navy in 2013, he became a medical missionary and moved to Chogoria Mission Hospital in rural Kenya, helping start a family medicine residency. He was also heavily involved with growth of the hospital chaplaincy program.  In 2021 Jim and his family moved from Kenya to Virginia, where he now serves as VP of Partnership Strategies with MedSend.

David Stevens, MD, MA (Ethics)
Dr Stevens is the CEO Emeritus of CMDA, having served previously as our CEO.  He is a well-known author and speaker.  He is a family physician and served from 1981-94 at Tenwek Hospital where he served as Medical Superintendent and Executive Officer. He then worked for World Medical Mission prior to returning to the US in 1994 to begin working for CMDA .  He has his master’s degree in bioethics and has been an important voice in the public square for promoting biblically sound bioethical principles. He is married to Jody, and they have three children and ten grandchildren.

Daniel Tolan, MD
Dr. Tolan will serve as your host for the Pre-Field Conference, and he considers this gathering the highlight ministry event of his year.  He is a family physician and served in Kenya at Tenwek Hospital with World Gospel Mission.  He and his wife Cindy now live in Johnson City, TN where he practices emergency medicine while remaining very active both in mission leadership and in mentoring the next generation of healthcare missionaries.

Ruth Van Reken,
Ruth Van Reken is a second-generation Third Culture Kid* (TCK) and mother of three now-adult TCKs. She is co-author of Third Culture Kids: Growing Up Among Worlds, 3rd ed., and author of Letters Never Sent, her personal journaling seeking to understand the long-term impact of her cross-cultural childhood. For more than thirty years Ruth has traveled extensively speaking about issues related to the impact of global mobility on individuals, families, and societies. She is co-founder and past chairperson of Families in Global Transition.  In addition to her two books and many articles, she has written a chapter in other books including Strangers at Home, Unrooted Childhoods, and Writing Out of Limbo.  In 2019 she received an Hon. Litt.D from Wheaton College for her life’s work. She now lives in Indianapolis, IN with her husband, David.