A former soldier in the British Army, Forsyth spent 22 years in service. He transferred units for the final six of those years, becoming an army photographer and following his passion for the medium. After he left the army in 2011, he began working as a freelance press photographer covering North Yorkshire and the North East of the UK. He continues to work in this capacity to this day, primarily as a stringer for Getty Images News and doing occasional assignments for The Financial Times, The Sunday Times, The Times and Bloomberg. He has covered a wide variety of stories and events, such as political party conferences, the COP 26 Climate Conference, daily life, features and other news stories; including, more recently, events surrounding the passing of Queen Elizabeth II.