Robert (Bob) Green
Executive Director
Bob Green serves as the Executive Director of CERT International, bringing decades of leadership experience and a deep commitment to global missions. After a 22-year career in project management with DTE Energy, Bob transitioned into ministry and began volunteering with CERT in 2005, serving on medical mission teams in Mexico and Romania.
In 2008, he stepped into team leadership and later served as Vice President for CERT Peru in South America. His experience spans multiple countries, where he has helped expand CERT’s reach and strengthen its impact through strategic partnerships and mission development.
In 2018, Bob was appointed Executive Director by the Board of Directors. Under his leadership, CERT continues to grow its global presence, serving in dozens of countries through medical care, humanitarian aid, and opportunities to share the Gospel.
Bob and his wife, Debbie, are actively involved in their local church in Crossville, Tennessee.
Kathleen Holden
Director of Operations
Kathleen Holden has been serving with CERT International since 2021 and is passionate about sharing the love of Christ through both word and action. With a background in Anthropology and a heart for people, she is committed to advancing CERT’s mission around the world.
A verse that has shaped her life is Psalm 18:19: “He brought me out into a spacious place; He rescued me because He delighted in me.” What began as a childhood promise has become a lifelong testimony of God’s faithfulness. This truth continues to inspire her passion to share the hope and love of Jesus with others.
Kathleen is especially burdened for those with little to no access to the Gospel. She is committed to helping build relationships and create opportunities for ministry in these unreached regions, trusting God to open doors for His message to be known around the world.
Dianna McGee
Administration
Dianna McGee, who prefers to go by “McGee,” brings more than 20 years of customer service experience and understands the importance of treating people with respect. Her diverse professional background includes work as a veterinary assistant, cross-country semi-truck driver, newspaper typist, bookkeeper, summer camp director, accounts receivable and payable specialist, auditor, process improvement and quality control specialist, production manager, and office manager for a multi-store NAPA franchise.
In addition to her professional experience, McGee remains actively involved in volunteer work. She designs flyers for the Anah Shriners Circus in Presque Isle, Maine, proofreads books before publication, and has taught women’s Sunday School on a variety of topics.
At CERT, McGee supports leadership and mission teams by maintaining financial records and ensuring the timely distribution of the monthly newsletter, while also handling the unique and unexpected needs that often arise in ministry.
Always up for a challenge, she enjoys seeing lives impacted by the love of Jesus through short-term missions that create long-term change, and spending time with a good mystery or political thriller.
Joshua Lenz
Team Leader
Joshua Lenz serves as CERT’s team leader for the Peru and Uganda mission teams. He spent eighteen years in Peru as a missionary kid, including ten years interpreting for CERT medical clinics, an experience that sparked his lasting passion for missions.
Although he took time away from the mission field to pursue school and work, he never lost the desire to return. Now, having the opportunity to serve again in the mountains and jungles where he grew up feels like a full-circle moment.
Joshua is currently pursuing an MFA at Boise State University in Idaho. While free time is rare, he enjoys camping, writing songs, and taking road trips whenever he gets the chance.
Tori Walker
Team Leader
Bio coming soon.