Rev Casper John “Jack” Wyrtzen

From Wikipedia:

Casper John “Jack” Wyrtzen (April 22, 1913 – April 17, 1996) was an American youth evangelist and founder of Word of Life ministries, which operates Christian camps, conference centers and Bible institutes.

Wyrtzen produced the Word of Life radio program, heard by a nationwide audience. He led the organization for fifty years until his retirement in 1991. Wyrtzen spoke in many churches and venues, holding meetings from the streets to stadiums; he is credited with influencing Billy Graham, George Verwer and other evangelistic leaders.

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• “Jack Wyrtzen.” Biola University, www.biola.edu/talbot/ce20/database/jack-wyrtzen.
• Newspapers.com, The Boston Globe, April 19, 1996, https://www.newspapers.com/article/the-boston-globe/191213270/