Marian Kociniak was born on January 11, 1936, in Warsaw and died on March 17, 2016, in Warsaw.

He was a Polish film and theatre actor.

Marian most notable for appearing in the 1970 film How I Unleashed World War II.

He was a graduate from The Aleksander Zelwerowicz National Academy of Dramatic Art in Warsaw in 1959 from the teachings of Ludwik Sempoliński.

Since 1959, until his passing, almost without intermission, he acted in the Ateneum Theatre.

He appeared on televised Theatre, reenacting many novels from the time.

He also appeared in Kabaret Starszych Panów.

He made his screen debut in the 1959 film Mr. Professor.

He appeared in over 30 films since then.

He also collaborated with radio appearing in the magazine 60 minut na godzinę, where he paired with Andrzej Zaorski on Polskie Radio Program III.

The demand of the actor influenced creations of Franek Dolas in the famous Polish comedy How I Unleashed World War II and as a burgrave in the show Janosik, directed by Jerzy Passendorfer.

In the 2003 VIII Festival of Stars in Międzyzdroje, he performed on the Promenade of Stars.

From the start of his career, he did not agree to interviews.

He had made an exception to the interview for the BBC to mark the 50th anniversary of his artistic work.

Marian Kociniak had been working with the Wola theatre (2010 to 2016).

Marian Kociniak was an honorary member on the committee for Bronislaw Komorowski ahead accelerated presidential elections in 2010 and before the presidential elections in Poland in 2015.

Marian Kociniak passed away at 80 yrs old.