While at Hofstra, he met producer Mickey Valen and they began a collaboration that would become the Lyon Hart project, as well as co-writing and producing for other artists including EVVY, Noosa, and Jojee. Lyon Hart began to write more songs to pitch for other artists and in 2015 collaborated on an album with “One Tree Hill” star Bethany Joy Lenz. Some of the songs written for other artists would eventually become solo singles for Lyon Hart, including the breakout viral hit, "Falling for You", which, to date, has over 23 million views on it’s smash music video. A followup single, "Delusional", has also garnered rave reviews from critics.
In 2018, Lyon Hart signed a publishing deal with Defend Music, and a new album is anticipated in late-2018.