Jaakson was the Estonian Minister of Education from 1936 to 1939, contributing to the establishment of various institutions—including Tallinn Technical University and the Estonian Academy of Sciences. His final contributions were as the last Chief of Staff of the Estonian Army, in which capacity he served from 1939 to 1940, reaching the rank of major general. With the onset of Soviet occupation, he was arrested by NKVD in 1940 and killed at Kirov two years later.
