He left Travers that year and later in the 1980s joined sisters Pam and Paula Mattioli in US AOR band Gypsy Queen (later to become Cell Mates in the early 1990s after Cowling's time in the band), appearing at the 1987 Reading Rock Festival and on Gypsy Queen's debut album before leaving the band later the same year. He rejoined Travers in 1989, and remained until 1993.
He left Travers in 1980 and subsequently joined sisters Pam and Paula Mattioli in US AOR band Gypsy Queen (later becoming Cell Mates in the early 1990s after Cowling's stint with the band), performed at the 1987 Reading Rock Festival and on Gypsy Queen's debut album before leaving the band again later that year. He rejoined Travers in 1989, and stayed until 1993.