After graduating from high school, he joined the Department of Law of the University of Lviv.

In 1899 he was one of the founders of the student organization ″Молода Україна″ (Young Ukraine) and belonged to its board of directors.

In 1918, Mr. Temnytsky elected to the National Council of the West Ukrainian People's Republic.

Member of the delegation Ukrainian People's Republic to the Paris Peace Conference, 1919.

He has a law practice, was active in the cooperative movement and as a writer of Ukrainian press.