Peter Biadasz

“David always has tremendous insight into any topic he presents… and he makes it fun! — Peter Biadasz, President, Total Publishing & Media

Lillian Walker

“I loved interviewing you and having you as a guest. You are a natural and true Pro.” — Lillian Walker, Bottom Line Live

Suzanna Axisa

“As a radio host I read thousands of self-help books, but I consider Dr. Gruder’s book on strategic self-development the only indispensable one, and I can’t recommend it enough…”  — Suzanna Axisa, radio host of Lanto’s Lantern —...

Mercedes Guzman

“In Dr. Gruder’s presence you feel a spiritual teacher, not merely a scholar in his field.” — Mercedes Guzman, Radio Show Host — Mercedes Guzman, Radio Show Host