Mihkel Klaassen was a justice of the Supreme Court of Estonia since 1924.

Klaassen was a member of the Electoral Committee that decided the Soviet-era appointment of Johannes Vares

Johannes Vares

Johannes Vares , commonly known as Johannes Vares Barbarus, was an Estonian poet, doctor, and politician.Vares was born in Heimtali, now in Pärsti Parish, Viljandi County, and educated at Pärnu Gymnasium...

 as Prime Minister by Konstantin Päts

Konstantin Päts

Konstantin Päts VR I/1 and III/1 was the most influential politician of interwar Estonia. He was one of the first Estonians to become active in politics and started an almost 40-year political rivalry with Jaan Tõnisson, first through journalism with his newspaper Teataja, later through politics...

 had been illegal and stated, that Jüri Uluots

Jüri Uluots

Jüri Uluots was an Estonian prime minister, journalist, prominent attorney and distinguished Professor and Dean of the Faculty of Law at the University of Tartu....

 is Prime Minister acting as President of the Estonian Republic on April 20, 1944.

He was the father of Professor Olaf-Mihkel Klaassen of Tartu University.