He was a co-founder of the Dinosaur Annex Music Ensemble, with Rodney Lister and Scott Wheeler, for which he served as president from 1977 to 1981 and as a member of the Board of Directors from 1981 to 2003.
He has lectured on his music in the US and abroad, most notably at the Hamburger Musikgespräch, 1994; the second Naturton Symposium in Heidelberg, 1992; and the 3rd and 4th Symposium, Mikrotöne und Ekmelische Musik, at the Hochschüle für Musik und Darstellende Kunst Mozarteum, Salzburg, in 1989 & 1991.
In 1992–93, he was guest lecturer in the Richter Herf Institut für Musikalische Grundlagenforschung in the Mozarteum.
With the American cellist Theodore Mook, he designed a font, now widely adopted, for use with computer printing programs, based on his set of accidentals, which are sufficient for 72-note music.
As his award citation from the American Academy of Arts and Letters attests: Ezra Sims has already contributed an outstanding body of works, many of which have explored with singular imagination, conviction and success the beautiful but elusive world of microtonal music.