He rejoined the band in 2003 until 2009 when he was replaced by Lane. After leaving Primus he formed the group Laundry. He was the first drummer for the band A Perfect Circle and joined the Blue Man Group. In 2013 it was announced that he would rejoin Primus. Alexander suffered a heart attack in 2014 and underwent open heart surgery but was back touring with Primus later that year. As a member of Primus he played on the albums Suck on This, Frizzle Fry, Sailing the Seas of Cheese, Miscellaneous Debris, Pork Soda, Tales from the Punchbowl, Animals Should Not Try to Act Like People, and Primus & the Chocolate Factory with the Fungi Ensemble.