In 2014 for his work entitled "Obsession with death in images of my documentaries" he obtained a doctorate degree in film studies and is now a lecturer in this university.
In 1999, after making two short films, he made his debut as a director with Such a Nice Boy I Gave Birth to, a document focused on relations within his own family.
The film was received enthusiastically in Poland and abroad, bringing him awards in Berlin, Cracow, Kazimierz Dolny and Nyon [citation needed].
After this strong debut he has made other no less appreciated movies [verification needed], like: It Will Be All Right, Death with a Human Face, Whole Day Together (dedicated to Jerzy Nowak), The Existence, Till it Hurts, Let’s Run Away from Her (dedicated to Piotr Korczak, a prominent Polish climber) The Declaration of Immortality, You'll Be a Legend, Man (a movie about Polish footballers preparing for UEFA Euro 2012), The Lust Killer.
The latter document, which indirectly tells the story of a serial killer from Bytom, led Koszałka to a directorial debut in a feature film.
After the release in Poland it was highly acclaimed by critics, film industry and audience yearning for a successful artistic cinema [citation needed], with some stylistic features indicating a genre affiliation.
It is a story of a serial killer operating in Poland in the 1960s, inspired only by real events and legends which have been circulating for many years around Cracow and rest of the country.
In 2014, the National Audiovisual Institute released a special DVD box set of his documentary films, thereby inviting Koszałka to the circle of the most outstanding Polish documentalists, who received similar recognition.
In April 2016 Marcin Koszałka won the Best Director award for The Red Spider at the goEast Festival of Central and Eastern European Films in Wiesbaden.