Callum Heinrich biography Callum Heinrich is an actor based in Guildford, London. He trained at Guildford School of Acting and graduated with a BA Honours in Musical Theatre (2016-2019). In the ongoing production of Mamma Mia!, Callum is part of the ensemble, playing understudy Sky, Father Alexander and Bill. Directed by Phyllida Lloyd, the show’s playing at the Novello Theatre. He became a Featured Ensemble in Drew Baker’s The Pirate Queen at the London Coliseum in 2020. Other Credits: During his training, Callum’s work involved playing Romeo/Mercutio in the workshop for Romeo & Juliet by Julian Woolford (2017), Soloist in Peter Roberts’ Go The Distance at The Electric Theatre (2018), Dancer in Richard Neale’s Earthquakes in London at Bellair’s Theatre (2018), Franklin Hart Jr in Samuel Harjanne’s 9 To 5 at Bellair’s Theatre (2018), John Reed in Sam Wood’s Jane Eyre at GSA (2019).