The play Mamma Mia was produced by which British playwright?
Harriet Thorpe:  She has also starred in the West End musicals, "Cabaret" (2006), "Wicked" (2008) and "Mamma Mia! Mamma Mia!:  The Smash Hit Musical) is a jukebox musical written by British playwright Catherine Johnson, based on the songs of ABBA, composed by Benny Andersson and Björn Ulvaeus, former members of the band.
Catherine Johnson