In 2022 Cooke announced about his retirement as pentathlete and new career as the head coach for Greek modern pentathlon national team.

[1] Cooke competed at the 2016 Summer Olympics in Rio de Janeiro, in the men's event, where he finished 14th.

[2] At the 2018 World Modern Pentathlon Championships held in Mexico City, Cooke overtook Valentin Prades who had celebrated too early to finish in first place.

[3] In 2019, at the European Championships held in Bath, Somerset, Cooke won a gold in the individual event.

[4] In 2021, Cooke competed at the delayed 2020 Summer Olympics in Tokyo, Japan in the Men's event.