[1][2] Fieldman competed at the 2014 World Rowing Championships in Bosbaan, Amsterdam, where he won a silver medal steering the coxed pair of Alan Sinclair and Scott Durant.

[4][5] In 2016 he coxed Oliver Cook and Callum McBrierty to another gold medal at the 2016 World Rowing Championships.

[6] He won a bronze medal at the 2018 World Rowing Championships in Plovdiv, Bulgaria, in the stern of the British eight with James Rudkin, Alan Sinclair, Tom Ransley, Thomas George, Moe Sbihi, Oliver Wynne-Griffith, Tarrant and Will Satch.

[7] The following year he won another bronze medal at the 2019 World Rowing Championships in Ottensheim, Austria in the eight with George, Rudkin, Josh Bugajski, Sbihi, Jacob Dawson, Wynne-Griffith, Tarrant and Thomas Ford.

[9] [10] In 2022, he won the Grand Challenge Cup (the blue riband event at the Henley Royal Regatta), coxing for the Leander Club.