He joined The Vendors in 1963, who in 1964 changed their name to The 'N Betweens; then to Ambrose Slade in 1969; and a few months later, on 24 October 1969, shortened that to
Slade. As the drummer with
Colonel Bagshot, McCusker toured with Slade in the 1970s and the two have remained firm friends. Powell collaborated with
Lise Lyng Falkenberg on his biography since 2006, in part using the notebooks and diaries he kept due to his problems with short-term memory following his 1973 accident. The biography, titled
Look Wot I Dun – My Life in Slade was released via the publisher Music Sales Ltd in October 2013. It covers in detail Slade's long career and Powell's life, which included booze-ups with
Ozzy Osbourne. In 2013, Powell created his own website, and in early 2014 he published his diary entries for 1977 and 1978. In February 2020, Powell announced that he had been fired by email by Dave Hill and would be forming Don Powell's Slade to perform Slade songs. The reason for Powell being dismissed wasn't officially given at the time. Noddy Holder eventually confirmed the reason for Powell being fired was because he had missed a few gigs because of an injury; on 28 December 2018 when at
Peterborough station, he snapped tendons in both of his legs and was hospitalised for five weeks, eventually returning to performing again on 1 November 2019. Powell had worried about his leg relapsing while on stage, and just two days after returning to the band following his injuries was advised by doctors that he would be crippled for life and be unable to walk if he did not stop drumming, but he refused and so Dave Hill reacted by firing him. According to Holder, many fans turned against Hill, and it affected him personally. Soon after departing from Slade, Powell's website mentioned that he was fit enough to play drums again. He formed "Don Powell's Slade". ==Car crash==