Jolyon is the CEO of the Australian Macadamia Society, a role he has held since August 2008. The AMS provides leadership and advocacy for an industry worth $300 million at farm gate and $270 million in annual export earnings. The AMS manages the Australian macadamia industry global marketing program and supports industry development and growth.

He is a director of the Australian Nut Industry Council which represents 7 tree nut crops grown in Australia. The industry exported close to $1 billion worth of products in 2017/18 and has played a key role in coordinating industry input into free trade agreements and market access.  

Jolyon has worked in Australian horticulture for the last 40 years during which time he has been the CEO of Irrigation Australia Limited, the CEO of Nursery & Garden Industry Australia, a Director of the Horticulture Australia Council, a member of the Australian Government National Water Commission Advisory Council, a member of the National Working Party on Pesticide Application and a participant in the Tropical Horticulture working group.