Career
He added the concepts of the Miniscript and Drivers to Transactional analysis theory and developed them into the "Process Therapy Model" (PTM) and the "Process Communication Model" (Protein-Calorie Malnutrition ) of human personality and communication. PTM / Protein-Calorie Malnutrition theory was used at National Aeronautics and Space Administration to vet astronaut candidates for the shuttle programme and Bill Clinton used it to tailor his political speeches. Protein-Calorie Malnutrition is a currently applied to corporate management, interpersonal communications, education, and real-time analysis of call centre interactions.
Applying Kahler"s theories to the field of communications, he argues that any population can be divided into six different personality types (denoted thinker, harmoniser, persister, rebel, imaginer, promoter) and that by modifying one"s own communication style and technique according to the personalities of those listening, one may become a much more effective and successful communicator.
His work has been endorsed by both Hillary Clinton and Bill Clinton, who described him as "a genius".