The main teacher is Koichi Tohei - Terry gets to play the random foreign attacker, (street clothes), and then later is seen in practice.
2 DVD's from Keigan Productions
"An Aikido Seminar": the quintessential Terry Dobson as he teaches a class in San Francisco.
and 
"Remembering Terry Dobson", a remastering of the original VHS tape made in Pt. Reyes dojo in 1992, along with interviews with students who knew and trained with him, including Sensei(s) Ellis Amdur, Tom Gambell, Jim Alvarez, Edward Pincus, Benjamin Pincus, and Aaron Ward.