Robbie began singing with the band periodically in 2014, standing in for Josh when the latter was unavailable due to family commitments. He officially joined the band on 7 August 2015, just ahead of Bristol's 2015 Severn Seas Festival. Robbie is the second baritone in the Longest Johns, and he mainly plays the harmonium.
Robbie is an accomplished performer, musician, and composer. He plays guitar as well as bass, and is a skilled keyboardist and drummer. He has been credited as a producer and sound engineer on a number of albums and YouTube videos, including several videos by Katie Sky.