Having worked with the finest conductors for 30 years as a member of groups such as the Academy of St Martin in the Fields, Philharmonia and Hallé, he learnt the repertoire and conductor’s craft from inside the orchestra, and finally made the transition to the podium in 2015, when he left Academy of St Martin in the Fields and went to study in St Petersburg with Alexander Polishchuk. Since then he has conducted orchestras across the UK, Europe, India, South Africa and Mozambique.

During his playing career, he performed concertos around the world and served as a guest with ensembles such as the Lindsays, Brodsky Quartet and Zukerman Chamber Players.

Leon is committed to rediscovering neglected music, as well as expanding and diversifying the double bass repertoire, and has recorded 16 CDs of wide-ranging programmes, with more in planning.

Throughout his career he has worked with leading composers, and his latest project is to revive the sonatina form for a programme he will tour and record for Meridian Records in 2021. He also commissions chamber arrangements of well-known symphonic classics for his ensemble I Musicanti, and set up I Musicanti Publishing in order to distribute these works.

He is professor of double bass at Trinity Laban Conservatoire of Music and Dance in London and gives masterclasses in the US, Europe, South Africa and the Far East. He has also served as double bass coach for youth orchestras including the I, Culture Orchestra, National Youth String Orchestra, Miagi Orchestra and Buskaid. He has contributed to programmes on BBC Radio 3 and 4 and written for The Strad and Classical Music magazines.

Leon grew up in South Africa, the son of the political activist Jonas Fred Bosch, and spent time in a police cell for organising protests while at school. He left the apartheid regime behind to study at the Royal Northern College of Music in Manchester.

He became a British citizen in 2000. In recent years he has returned to his roots, musically, forming the Ubuntu Ensemble with other UK-based South African musicians, and commissioning music for the South African Double Bass project, the first CD of which was released in 2020. He also acts as a mentor for South African musicians worldwide.

Away from music, he runs marathons and ultra-marathons and holds a Master’s degree in Intelligence and International Relations from Salford University.