Albert Fuller (1926–2007) was a harpsichordist, organist, and conductor who studied with RK at Yale in the early 1950s. He also studied music theory with Paul Hindemith. Fuller graduated from Yale with a master's degree in music in 1954. He established a solo career as a harpsichordist and made a number of well-regarded recordings. Fuller was appointed a professor at the Juilliard School in 1964, and in 1972 he founded the Aston Magna Foundation, which included an early-music ensemble that he conducted from the harpsichord. He broke with Aston Magna in 1983 and in 1985 founded the Helicon Foundation, which also had a performing ensemble that presented concerts using original instruments. He retired as its director in 2006. The letter included here reflects Fuller's appreciation of RK as a performer and teacher.

January 23, 1954

Dear Ralph—

I have just written your exam on the board and the victims are at work. You naturally come to mind along with some thoughts in random order about last Wednesday's program.

Forgetting for a moment that my point of view is atypical, I can only say that this was certainly the finest playing I have ever heard you do. In respect both to your self and your public, this was a triumph in its basic and most forceful meaning. Having heard these works at Sprague, I was amazed to find your whole conception tighter, the individual phrase, or half of [the] sonata, the whole sonata, a pair, and the grouping even of pairs was constantly impressive in relation to the whole program. The constant and absolute control and command over the whole conception (without mentioning the uncanny technical apparatus) evokes in my mind the well known statements about Paganini, etc. I know that I am not alone in feeling that your performance was beyond doubt the most honest, inspired, well planned, perceptive, and most successful combination and comixture of composer with performer that many have ever come in contact with.