I read Botany at University College Oxford. After graduation, I worked as a trainee at Oxford Botanic Garden, the Savill Garden Windsor, and the Royal Botanic Gardens Kew. In 1995 I was awarded a Master of Horticulture by the Royal Horticultural Society of London.

From 1988 to 2014 I was director (Horti Praefectus) at the Oxford Botanic Garden. Between 1992 & 2000 the OBGHA won 4 gold medals at the Chelsea Flower Show London. In 2009 the Botanic Garden was awarded a Queen’s Anniversary Prize for providing imaginative educational programmes for adults, students, children, and the general public, thereby breathing new life into education for people of all ages and enriching their lives.

In 2010 I was elected as a Fellow of the Linnaean Society of London. In the same year I presented a 3-part series of films on the history of botany on BBC4.

Since 2014 I have been a tutor in Plant Biology at Somerville College, Oxford.