After appearing in, among other Broadway and Off-Broadway productions, "Master Harold"...and the Boys, A Christmas Carol, The New Group's The Music Teacher and columbinus at the New York Theatre Workshop, Steggert starred as Jimmy Curry in the 2007 Broadway revival of the musical 110 in the Shade, a role which garnered him an Outer Critics Circle Award nomination.
He starred in A. R. Gurney's The Grand Manner at Lincoln Center Theater in the summer of 2010, opposite Kate Burton, Boyd Gaines and Brenda Wehle.
Steggert starred as Will Bloom in the musical version of Big Fish alongside Norbert Leo Butz and Kate Baldwin.
Ben Brantley's New York Times review (October 6, 2013) said, "Mr. Steggert's singing exudes a radiant sincerity that transcends corn.
"[7] He co-starred (as Will Ogden) with Tyne Daly in the premiere of Terrence McNally's Mothers and Sons at the Bucks County Playhouse in New Hope, Pennsylvania.
[8] Mothers and Sons ran on Broadway at the John Golden Theatre from February 23, 2014 to June 22, 2014, with Steggert and Daly, joined by Fred Weller, and original director Sheryl Kaller.
"[11] He earned a Master’s in Social Work from Columbia University and trained as a therapist at the Institute of Contemporary Psychotherapy in their Gender and Sexuality Program.