Born Philadelphia, Pennsylvania 1971. Cummings was a member of the all-girl group Boy Krazy, with whom she had major dance club success with their singles in the UK and the US [m=178121] is their most famous track, where it hit #18 in America in 1993, nearly 2 years after its release. The song had charted in the UK upon initial release at #86 in 1991. It re-entered the charts at #80 coinciding with the increase in American popularity. The American follow-up, [m=178125] peaked at #59 in the US. In the UK, the group's second single released in that territory, [m=381349] peaked at #91.

Cummings, having disbanded with her bandmates, signed a record deal in the mid 1990s with PWL International Ltd. Under the name Johnna, her 1996 debut single, [m=117931], received attention and featured remixes by dance music producer Matt Darey. The radio edit, peaked just outside the Top 40 in the UK Singles Chart, at #43. The follow-up, another uptempo house-pop track, [m=117933], peaked at #66 in the UK chart. An album called Pride was released in 1996. It failed to reach the UK Albums Chart. Nevertheless, Cummings' label released the title track as a single. It was produced by Motiv 8. The single failed to reach the UK Singles Chart, and the same was true of her next single, [m=117937]. Cummings was briefly engaged to a former kickboxing champion, Mike Vieira.

Johnna's current lifestyle is chronicled in the short documentary, Expect Less