He received his secondary education at the Hugo Treffner Gymnasium in Tartu and graduated in 1928.
The next Archbishop, Alfred Tooming also named Hark as his permanent deputy on 18 October 1967.
Hark was appointed Dean of Tallinn on 1 October 1972, but resigned for health reasons on 10 September 1974.
[2] The archbishop died in office in Hospital number IV in Tallinn on 23 October 1986.
Hark was awarded three honorary doctorates by the Károli Gáspár University of the Reformed Church in Hungary, the University of Helsinki and the Institute of Theology of the Estonian Evangelical Lutheran Church.
He was also awarded with the Order of the Patriotic War, the Order of Friendship of Peoples, five medals and the honorary prize of the Presidium of the Supreme Soviet of the Estonian Soviet Socialist Republic.