Roi Ruottinen began his cello studies at the age of four at the Vantaa Music Institute. In 1990 he entered the Sibelius Academy and in 1994 completed his studies with excellent grades, winning the shared first price in the Turku Cello Competition. In 1995–1996 he studied at the Royal Danish Academy of Music.
Many cello works have been composed for Ruottinen and he has collaborated with a number of important composers, including Saariaho, Penderecki, Lachenmann, Wennakoski and Pulkkis. Since 2013 he has served as a cello teacher at the Sibelius Academy. Ruottinen’s instruments are a David Pizzurnus 1769 Genoa and Pierluigi Galetti 2010 Cremona.