Watercolourist and teacher, born in Austwick, Yorkshire. He studied at Burnley School of Art, graduating in 1910. Gained a Travelling Studentship in 1911 and an RIBA Owen Jones Studentship in 1912. Leaver then taught at Halifax School of Art. He travelled widely abroad, producing such works as In Sunny Algiers and In Morocco. Showed at a wide range of galleries and had works bought by Burnley Corporation, settling in the town.