 Alexander has also collaborated with experimental bass player Michael Manring and guitarist Alex Skolnick to form the group known as Attention Deficit.Alexander was the first drummer of A Perfect Circle, performing early live shows with the band, and recording drums for the track "The Hollow" on the band's debut album, "Mer de Noms".Alexander joined the theatrical group Blue Man Group, and has occasionally played with the Las Vegas-based improvisational rock band Überschall.