Some of his other Broadway credits include roles in Dance a Little Closer, Fiddler on the Roof, and Sunday in the Park with George, as well as several others.
[2] In 1984, Keller joined the original Broadway cast of Sunday in the Park with George understudying the title role.
[2] In November 1990, he stepped into the title role for a month in between the stints of Steve Barton and Kevin Gray.
[4] He also played the role of Jacob Marley in the annual production of A Christmas Carol at The Theater at Madison Square Garden.
[1] In 2001, Keller switched roles with George Lee Andrews, "to keep things fresh", portraying Monsieur Firmin in Phantom.