Mart Kuusik won a bronze medal in single sculls at the 1912 Stockholm Olympics. He studied in St. Petersburg after which he earned a graduate degree from Oxford University in 1914. Kuusik was Russian Champion in single sculls in 1910 and 1913-14. He founded the Kalev Sports Association in St. Petersburg and served as its secretary.
During World War I Kuusik served with Russian troops during the Winter War in Finland. He was imprisoned in Russia in 1920-21, but was able to escape thanks to the Estonian-Russian Peace Treaty. In 1921-22 he served as an administrator of boxing in Tallinn. By 1924 he had emigrated to the United States, where he lived in Washington state and owned an auto shop. He eventually died in Washington state.