Johnny was born in London and studied classical piano and clarinet from a young age, playing in orchestras and gaining an ABRSM diploma in piano performance. Upon moving to Ireland, he became a music scholar at Trinity College and graduated with a First Class Honours degree in 2006. After studying with a scholarship at Berklee College of Music in Boston, Johnny returned to Dublin and began playing jazz full time.
He currently leads his own piano trio as well as playing in the groups of various notable Irish musicians including Nigel Mooney, Cormac Kenevey, Alex Mathias and Suzanne Savage and Louis Stewart. Currently he is musical director for Emilie Conway. In April 2014 he toured with The Emilie Conway Quintet in Ireland, presenting the Songs of Alec Wilder.