Noted for his "powerful, stalwart and metallic" bass voice, as well as his "appealing and enthusiastic stage presence," Stephen Clark has developed a reputation for giving engaging performances. Much of his professional career has been spent in Germany. He spent five seasons as an ensemble member with the Theater am Goetheplatz in Bremen for five seasons, making his debut with Graf Ribbing (Sam) in Verdi's Un ballo in maschera. In his time there, he performed a number of roles: L'elisir d'amore as Dulcamara, Il barbiere di Siviglia as Don Basilio, The Abduction from the Seraglio as Osmin, Don Giovanni as Leporello and Masetto, Péter Eötvös' Angels in America as Roy Cohn, L'italiana in Algieri as Mustafà, Alcina as Melisso, The Cunning Little Vixen as Harašta, Jenůfa as the Mill Foreman, Falstaff as Pistola, The Queen of Spades as Tsurin, Ariadne auf Naxos as Truffaldino, and The Magic Flute as Sarastro and The Speaker, roles which he performed over 30 times in two different productions during his time in Bremen.

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While in Germany, Stephen also made debuts with the Volkstheater Rostock as Harašta in The Cunning Little Vixen and (most notably) with the Staatsoper unter den Linden in Berlin as the Mill Foreman in Jenůfa. He also had the opportunity to appear in concert with the Bremen Cathedral Choir as Pilate and Bass Soloist in Bach's St. John Passion on Good Friday in 2022, and also was the soloist for a concert of selections of Bach's Christmas Oratorio which Theater Bremen performed during the pandemic.

Before his time in Germany, Stephen was a member of Yale University's prestigious opera program, where he studied with Richard and Doris Cross. Credits from his time there include Sarastro in The Magic Flute, Don Alfonso in Così fan tutte, Luka in William Walton's The Bear, The Father-in-Law in Darius Milhaud's Le pauvre matelot, as well as selections from Faust as Mephistopheles, Lucrezia Borgia as Duke Alfonso, and La bohème as Colline. He also appeared as a bass soloist in Stravinsky's Renard with Orchestra New England, Handel's Messiah with the Hartford Chorale, and Beethoven's Ninth Symphony with the Waterbury Symphony, the Hartford Symphony, and the Yale Philharmonia under the baton of Marin Alsop. He has also appeared with Central City Opera as Angelotti in Tosca, Chautauqua Opera as Masetto in Don Giovanni, the Fort Worth Opera Festival as Dr. Grenvil in La traviata and the Ghost in Thomas' Hamlet, and Tulsa Opera as Schaunard in La bohème.

Stephen resides in Chicago, where he currently enjoys being a staff singer with the renowned St. James Cathedral Choir. He has also been involved in projects with Chicago Opera Theater, most notably their Vanguard Initiative for new composers, and he has also performed as a soloist with the Apollo Chorus of Chicago in Handel's Messiah. In May of 2026, he will make make his debut with the Champaign-Urbana Symphony Orchestra as the bass soloist in the Messa di Requiem by Verdi.