Tumminello grew up in St. Louis, Missouri. According to his own statements, he started performing at the age of 11. One of the bands he played with was King Kobra, from 1983 to 1986.
In 1986, Rod received an offer to join the heavy metal band, W.A.S.P. His main bass at that time, was a yellow B.C. Rich Ironbird. He played on the albums Inside the Electric Circus (1986), Live... in the Raw (1987) and The Headless Children (1989) and accompanied the band on their 1992 farewell tour. Later attempts for a reunion of the classic line-up failed, mainly due to singer Lawless, according to Rod, as well as the rest of the members of W.A.S.P. during that era.
In 2010, he reunited with King Kobra. The band went on hiatus after two album releases in 2013, and reunited again in 2016 for several live performances.

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