Alexander Mason was born in Cheltenham in 1974, his early musical training taking place at Gloucester Cathedral, first as a chorister and then as organ scholar. He studied interpretation with David Sanger whilst organ scholar at Worcester College, Oxford and subsequently studied improvisation with Jos van der Kooy at the Royal Conservatory, The Hague. He was supported by generous awards from the Countess of Munster, Ian Fleming and Eric Thompson trusts.

Alexander became a Fellow of the Royal College of Organists aged 18, winning three prizes, and was runner-up four years later in the Tournemire prize for improvisation at the St Alban's International Organ Festival. In 2001 Alexander won the Grand Prix for Improvisation at the Andre Marchal Organ Competition in Biaritz, and the jury prize for the best improvised Theme and Variations.

Alexander has performed as a recitalist all over the UK, Ireland, Norway and Lebanon. He has broadcast on BBC Radio 3 with the choirs of Guildford Cathedral and St Bride's, Fleet Street, and has recorded for the BBC's sit-com The Vicar of Dibley and Channel 4 television's Howard Goodall's Organ Works. He is currently the Director of Music at All Saints' Parish Church, Fulham.