Subsequent instructors have included Fred Fox, Don Peterson, Thomas Greer, Wendell Hoss, James Decker, Vincent DeRosa and master classes with Hermann Baumann.
Thatcher was a faculty member the USC Thornton School of Music as the co-professor of Horn.
Thatcher has the enviable position of being the favored first horn of multiple-Oscar-winning composer John Williams performing in such films as Always, Jurassic Park, The Lost World, Sleepers (in which he received an on-screen credit), Nixon, Schindler's List, JFK, Sabrina, Home Alone, Rosewood, Seven Years in Tibet and The Patriot as well as the fanfare for the 1992 Olympics.
He can also be heard in the tracks to Glory, The Rocketeer, Field of Dreams, Monster House, X-Men: The Last Stand, Robots, Spider-Man 3, Ice Age, Polar Express, Beowulf, Dances with Wolves, Toy Story, Cars, Maverick, Apollo 13, Forrest Gump, Titanic, Pearl Harbor, Constantine, National Treasure, Transformers, The Simpsons Movie, Night at the Museum, Dinosaur, Atlantis: The Lost Empire, King Kong, Signs, Lady in the Water, Peter Pan, First Knight, Hook as well as Independence Day, and the Star Trek films.
[citation needed] In 2010, Thatcher was principal horn on James Newton Howard's soundtrack of The Last Airbender directed by M. Night Shyamalan.