If you search on "Masselos" on the web, you will be surprised at how many home pages of pianists come-up who mention him as a mentor and teacher.

Masselos provides a benchmark against which many reviewers compare newer Satie interpreters.

1996 Penguin Guide:
EURO 74321-24214-2 See CD description at BMG Classics

William Masselos made his reputation with the piano music of Charles Ives, but he proves equally at home with another musical eccentric and this is an outstanding and well-chosen selection of Satie's piano music, beautifully played and well recorded (in 1968) which makes this the least expensive recommendable Satie CD in the catalogue. Alas, the Debussy couplings are played by Alexis Wessenberg who is altogether less sensitive.

Fanfare May/June 89, William Zagorski:
( review of Armengaud)

If you are lucky enough to own or to have access to the old, long-deleted William Masselos MGM disc <this is on the BMG CD> containing, among other items, the Gnossiennes, cherish it. If you don't have it, start haunting flea markets. Two minutes of Masselos gives one a vivid idea of what this music really is.

<there are many other references to Masselos throughout the reviews>