Gemignani is known for his roles in Broadway musicals, including
Assassins,
Sweeney Todd: The Demon Barber of Fleet Street,
Les Misérables,
Sunday in the Park with George, and
Carousel, receiving a
Tony Award nomination for the latter. His film and television credits include
The Producers,
The Good Wife,
Homeland,
Chicago Fire,
Empire, and
The Marvelous Mrs. Maisel (recurring as Janusz, the eventual husband of the Weissmans’ maid, Zelda). Gemignani participated in a memorable performance of "Opening Doors" from
Merrily We Roll Along at
Symphony Space's
Wall to Wall Sondheim event celebrating
Stephen Sondheim's 75th birthday in March 2005. He also performed in three gala concerts honoring Sondheim's 80th birthday in 2010: with the
New York Philharmonic at
Avery Fisher Hall, singing "
Something's Coming" from
West Side Story in March; then at
New York City Center in April; and with
The New York Pops at
Carnegie Hall in November. He performed "Buddy's Blues" from
Follies in the online 90th birthday celebration
Take Me To The World on April 26, 2020. He made his conducting debut with the New York Philharmonic in
Live from Lincoln Center's ''New Year's Eve: Celebrating Sondheim'' on December 31, 2019. Recently, Gemignani has begun to work as a music director, following in his father's footsteps. He served as the conductor, music director, and music supervisor for the 2020 revival of
West Side Story, and has developed pieces for the
Public Theatre and the
Roundabout Theatre Company. He served as music director and orchestrator for the Fiasco Theatre production of
Merrily We Roll Along. He is the artistic director of both the
Eugene O'Neill Theater Center's National Music Theater Conference as well as the American Music Theatre Project at
Northwestern University. He is also an educator and is an associate professor at Northwestern University. ==Theatre credits==