Jefa is a founding Director of Greenaway Architects (est. 1998), an Adjunct Industry Fellow at Swinburne University, an Honorary Fellow of Design at Deakin University and is a registered architect in NSW, and Victoria.

Current/recent projects include the UTS National First Nations College, winner 2024 WAFX Cultural Identity awards, the Garma Institute in North East Arnhem Land, the Koorie Heritage Trust at Federation Square and Yaitya Ngutu Wardli at Adelaide University. He also serves on the State Design Review Panels in both NSW and Victoria, since 2019 and was a co-author of the award winning International Indigenous Design Charter.

He was a 2020 Design Institute of Australia’s ‘Hall of Fame’ inductee, signifying an outstanding contribution to Australian design. In addition, he was named in the 'Qantas 100 Inspiring Australians' and received the 2023 INDE.Award special prize 'the Luminary' recognising excellence in a career in design which celebrates industry icons. Further, Jefa was recently honoured for his pioneering efforts in Indigenous-led architecture and design, as recipient of a Doctorate of Design (Honoris Causa) from Swinburne University.