[3] Ferris performs solo piano and vocal arrangements of classic British and American songs by artists such as George Gershwin, Billy Joel, and Elton John.

[6] Early in the COVID-19 pandemic, Ferris broadcast "Live Piano Request" shows on his social media from his Shoreham home.

Over time he came to work with Rob Ashford and other musical theater producers, and in 2012 was vocal coach, pianist, and assistant to conductor David Charles Abell for the Finding Neverland world premiere production.

[11] When he performed at an international press launch event for the Prince William–Kate Middleton royal wedding, a chance meeting with piano technician Ulrich Gerhartz led to his relationship with Steinway & Sons.

The duo collaborated with the London Symphony Orchestra in 2019 on a recording at Abbey Road Studios of their symphonic arrangement of Muse's hit "Uprising"[15] and perform internationally.

[17] Ferris has collaborated on recordings with performers such as Shirley Bassey, Jonathan Antoine, Alfie Boe, Michael Ball, and Kerry Ellis, many with producer Nick Patrick, and on symphonic albums with the Royal Philharmonic Orchestra performing music of Elvis Presley, Roy Orbison, and The Beach Boys and orchestrating and arranging for the Orbison and Beach Boys albums.

[18] He produced a video for the Official London Theatre’s YouTube channel titled "We'll Meet Again" that featured West End stars including Alfie Boe and Hannah Waddingham and most prominently, Dame Vera Lynn extending a message of hope and love during the COVID-19 pandemic lockdowns.