For the past twenty years that I've been presenting my ideas at schools and districts, I would have to say that the main reason I was invited to speak was through a word-of-mouth recommendation. Teachers who have heard me present at conferences or universities often go back to their own sites and pass along this thought:
"We need to get this guy to come to our school!"
If you're looking for a more professional referral, you can contact any of the educators listed below. I've worked with them on an annual basis and they would be more than happy to provide you with information about the presentations I do and the response they've gotten from the teachers with whom they work.
San Joaquin County Office of Education
Placentia/Yorba Linda School District
West Orange County Professional Development Center
Dr. Allan Lifson
Effective Teaching Institute
Bureau of Education and Research
Capistrano Unified School District