Stevenson has wide experience in general and trauma counselling and is widely recognised as an international trauma psychologist. His experience includes on-site involvement with the Moura Mine Disaster in 1994, the Port Arthur Massacre (Australia) in 1996, the Thredbo landslide in 1997, the Bali bombings in 2002 and 2005, the Marriott bombing (Jakarta) in 2003, the 2004 Australian Embassy bombing in Jakarta, the Indian Ocean tsunami recovery in 2004–05, the Victorian Bushfires in 2009, He received a Medal of the Order of Australia for his work following the 2002 Bali Bombings. the 2010–2011 Queensland floods, Cyclone Oswald, and support for the families of those lost in Malaysia Airlines Flight 370.