He temporarily replaced Joe Perry when he left the band in 1979, and contributed guitars to the studio album Night in the Ruts (1979).
Additionally, Supa wrote or co-wrote several Aerosmith songs, including the hits "Chip Away the Stone" (1978), "Lightning Strikes" (1982), "Amazing" (1993) and "Pink" (1997), among others.
Supa co-wrote most of the songs on Bon Jovi guitarist Richie Sambora's second solo album Undiscovered Soul.
He wrote the song "Misery" for the album Missundaztood by Pink, on which both Aerosmith's singer Steven Tyler and Richie Sambora feature.
Supa also collaborated and co-wrote the songs "My Interpretation", "Your Sympathy" and "Instant Martyr" from Mika's debut album Life in Cartoon Motion.