[9] During the pandemic of 2020, Joiner was a featured vocalist for GRATEFUL, The Songs of John Bucchino 20th Anniversary Virtual Concert along with Leslie Odom Jr., Stephen Schwartz, Corey Cott, Mykal Kilgore, Ann Hampton Callaway, Toni Tennille, Amanda McBroom, and Andrea Marcovicci.

[14] At MSM, studying under tenor Neil Rosenshein, he performed the role of Chevalier de Danceny in Conrad Susa's The Dangerous Liaisons conducted by George Manahan; collaborated with the Escher String Quartet and artists such as Marcus Paus, Wang Jie, Ted Hearne and Jeanine De Bique; and appeared in a live stream master class with Thomas Hampson broadcast on Medici.tv.

Joiner was the 2011 winner of the Heafner-Williams Vocal Competition and won the Middle/East Tennessee district of the Metropolitan Opera National Council Auditions (2011) when the judges included soprano Diana Soviero.

[18] As a tenor, his first professional roles were with Asheville Lyric Opera, including Ferrando (Così fan tutte), Nemorino (L'elisir d'amore), Tamino (Die Zauberflöte), Goro (Madama Butterfly), and Basilio / Don Curzio (Le nozze di Figaro).

[19] While in North Carolina, he appeared as soloist with the Asheville Symphony Orchestra under the baton of Daniel Meyer in Gerald Finzi's For St Cecilia (broadcast live on WCQS Radio), Handel's Messiah, Mozart's Requiem, scenes from West Side Story and Holiday Pops Concerts.

[22] His most prominent Carnegie Hall appearance came as the tenor soloist for the US Premiere of Patrick Hawes's The Great War Symphony conducted by the composer on Veterans Day, on the 100th Anniversary of the Armistice.

The Vienna Summer Music Festival premiered Joiner's fifth one-act opera, The Shower, in June 2019 at the Wiener Kammeroper, conducted by Ian Niederhoffer and directed by Jennifer Davison.

[39] Joiner wrote classical and orchestral pops arrangements for A Night of Opera and Couture at Zankel Hall, serving as music director and conductor in 2018.