Charles Caldwell Ryrie ( born March 2 1925 ) is a Christian writer and theologian who served as professor of systematic theology and dean of doctoral studies at Dallas Theological Seminary and as president and professor at what is now Philadelphia Biblical University .
Charles Caldwell Ryrie ( born 1925 ) is a Christian writer and theologian . 
 For many years he served as professor of systematic theology and dean of doctoral studies at Dallas Theological Seminary and as president and professor at Philadelphia College of Bible , now Philadelphia Biblical University .