Robertson is stepping into rehearsals for the world premiere of Keith Huff's The Detective's Wife at Writers' Theatre in suburban Chicago.

Broadway in Chicago and Working's producers announced the cast change. Finnegan, the recipient of two Jeff Awards, three Jeff Citations and three After Dark Awards, joins cast members E. Faye Butler, Gene Weygandt, Emjoy Gavino, Michael Mahler and Gabriel Ruiz. Gordon Greenberg directs.

The show about vocations is based on the book by Pulitzer Prize-winning author and Chicago hero Studs Terkel. For the record, it's "adapted by Stephen Schwartz from the original adaptation by Stephen Schwartz and Nina Faso."

Working is a musical exploration of 26 people from all walks of life, with songs by Craig Carnelia, Micki Grant, Tony Award winner Lin-Manuel Miranda, Mary Rodgers, Susan Birkenhead, Stephen Schwartz and Grammy Award winner James Taylor.

Performances began Feb. 15. The run was originally announced to end May 8, but an extension to June 5 was added. Working is produced by Jed Bernstein, Dianne Fraser and Sheila Simon Geltzer, who hope to move the show on to a wider commercial life.

For more information, visit www.BroadwayInChicago.com or www.WorkingTheMusical.com.