Among the Broadway performers, who knows ASL?

Recently, a friend (who is Deaf) asked me if I knew which performers on Broadway knew sign language (ASL or any of the other English sign systems such as SEE). Any ideas? Not counting Deaf performers such as Phyllis Frelich and Tyrone Giordano, which we know DO know ASL).

From the top of my head -
Gwen Stewart (confirmed, signed with her at the stage door while everyone else was screaming).
Andy Richardson (from Newsies)
Richard Griffiths (he's a CODA - child of Deaf adults)

Anybody else? Any encounters at the stagedoors? Level of fluency aside from the "thanks" and the ILY sign that I usually get when I sign to someone at the stagedoor.

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Michael Seelbach majored in sign language interpreting. Saw him as Fiyero in "Wicked" back in 2007 (Chicago sit-down production). Even while he performed onstage, I could tell that he had ASL knowledge from his gestures and facial expressions :)

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Michael Arden has extensive knowledge, signing in Pippin when he was in it , plus directing Spring Awakening, both for Deaf West. He has also tweeted before about dreaming in ASL.