My teacher is Tyler Erickson. He is not well known outside the midwest, He consistently gets awards in this area and holds both private and group classes, and also is active in the local SYM chapter. although he has lectured as far away as Dallas,(or was it Houston?) not many outside Minnesota know of him other than Paul Cummins, and several other 'big' names. His web page is at www.tylerteach.com.
Tyler was a student of Joe Fortier (Spelling?) and Al Schneider. I've also spent some limited quality time with Al on some stuff, as Al lives very close to me, we used to meet every friday at a magic store at the Mall of America until 9/11/01 made it too scary to be at such a big mall so we disolved those meetings, usually two or three people besides Al would attend weekly.
Tyler has two videos that are sold by BeholdLearning, called "A new angle on Magic". One on cards which specializes on "The worms-eye" pass, which is a bottom card cover dribble pass, sort of... Designed for table hopping where you are above or equal to the eye level of the spectator. Also some material on psychology, presentation, and top changes. He also has a tape mostly based on coins of which much is beyond my skill level at this point.
His knowlege and expertise on cards rivals just about anyone I can think of, and I've seen a lot of good magicians.
He has been of great help to my fascination with gambling moves, such as false shuffles and deals. Another person I rely on quite a bit is an ex-vegas dealer that really has the moves down pat and has given me quite a bit of help in routining my deals and shuffles so they look legal, but I can't reveal his name. It got on his good-guy list after he saw my endless chain routine, which I learned from Whit Haydn at a convention.