[4] Van Horn won the Metropolitan Opera National Council Auditions in 2003[5] and made his debut on the operatic stage in 2004 at the Florida Grand Opera,[6] where he sang Lu Duc in Gounod's Roméo et Juliette.
[7] In 2007 he sang the American premiere of Tan Dun's Tea at Santa Fe Opera[8] and the World premiere of David Carlson's Anna Karenina at Florida Grand Opera.
[14] That same year he performed the title role of Boito's Mefistofele at the Metropolitan Opera.
[15] His debut at the Opéra National de Paris took place in 2019, as Nabal in Berlioz's Les Troyens.
[16] He toured with the Metropolitan Opera Orchestra in Asia in 2024, performing the title role of Bartók's Bluebeard's Castle at Lotte Concert Hall in Seoul.