[2] Kaplan is a founder of the Aeolian Chamber Players and a co-founder of the Bowdoin International Music Festival.
He has presented master classes at most of the well-known conservatories and schools worldwide, including the Mozarteum Summer Academy in Salzburg, Austria where he taught for 20 years.
Kaplan's chamber and violin students have included Yo-Yo Ma, Emanuel Ax, Pinchas Zukerman, Kyung-Wha Chung.
[4] Kaplan has made numerous television appearances and has premiered more than 100 works, both as a soloist and with the Aeolian Chamber Players, by most of the well-known composers worldwide.
He has performed as well with Michael Rabin, Jaime Laredo, Szymon Goldberg, Ruggiero Ricci, pianists Yefim Bronfman, Richard Goode, Rudolf Firkusny, Murray Perahia, Horacio Gutierrez and many others.