No matter where you live, I'm sure there is a trumpet player / teacher that has either studied directly with William Adam or has been lucky enough to have studied with one of his students:
Here is a partial list of former William Adam students teaching his method:
Dr. Karl Sievers – University of Oklahoma
Greg Wing – Morehead State University
Bob Baca – University of Wisconsin - Eau Claire
John Harbaugh – Central Washington University
Jay Coble – University of South Florida
James Stokes – Appalachian State
Charley Davis – North Hollywood, CA
Bobby Burns – Los Angeles, CA
Jim Reed – Columbus, Ohio
Richard Winslow – California State University (retired)
Jim O'Banion – Portland, Oregon
Vicki Hastings – Rockford, Illinois
David Beatty – Azusa Pacific University (Trombone)
Phil May – Bloomington, Indiana