He added the concepts of the Mini-script and Drivers[2] to Transactional analysis theory.
His father died in combat in April, 1945 while serving in the United States Army in the European Theater, resulting in Kahler being raised by his single mother in Hammond, Indiana.
Kahler attended Hope College, in Holland, Michigan, before transferring to Purdue University where he graduated with B.A.
In 1977, he received the Eric Berne Memorial Scientific Award from the International Transactional Analysis Association.
[3] Kahler's argues that any population can be divided into six different personality types (denoted thinker, harmoniser, persister, rebel, imaginer, promoter) and that by modifying how we say what we say, according to the personalities of those we interact with, we can become more effective communicators.