One of the best ways to learn about Jack is to read his posts. Here are a couple early ones:
Trainer, Speaker or Actor? Why Not Acting in Business? In Training?

and If I Am An Actor Why Am I Here?

Jack has extensive experience in training and his diverse background in speech, acting, psychology as well as performance criticism brings a broad, yet deep, perspective on training that we all can learn from. Often, he picks an angle from different perspectives–the employer, the employee being trained and the trainer.

To learn more, see his website or email him.