A/Prof. Joshua is a Rheumatologist working at both Kogarah and Randwick. He also works at the Prince of Wales Hospital as a Staff Specialist in Rheumatology. He is active in education of medical students and junior doctors. He continues to be active in international research, in imaging in rheumatology, and is a member of international collaborations including the OMERACT Ultrasound Taskforce and has been an educator for the EULAR Ultrasound course. His Australian Musculoskeletal Ultrasound company furthers Ultrasound education for rheumatologists in the Asia Pacific.
In 2016 A/Prof Joshua became an ASUM Councilor, in 2018 elected President of ASUM.