Klemens is a Vienna based cinematographer who studied at the Vienna Film Academy and was granted a scholarship for the 2011 Budapest Cinematography Masterclass led by Vilmos Zsigmond.

In 2013 he shot his first feature MACONDO which premiered at the Main Competition of the 2014 Berlinale and subsequently won numerous international awards as well as a nomination for Best Cinematography at the Austrian Film Awards 2015.

 
His Second collaboration with director Sudabeh Mortezai JOY premiered at the Venice Film Festival 2018 and won at the London Film Festival among others. THE EREMITES also premiered at Venice and won Best Cinematography at the Austrian Film Awards 2019. HUMAN FACTORS his second collaboration with Ronny Trocker was selected for the Sundance World Dramatic Competition 2021.

Other feature films include the horror film THE DARK (Tribeca Film Festival 2018), the documentary BROTHERS OF THE NIGHT (Berlinale 2016, Best Cinematography RIDM Festival Montreal) and MOVEMENTS OF A NEARBY MOUNTAIN (Best Cinematography Diagonale Festival 2019).

With director Catalina Molina he also shot numerous TV films for Austrian television.