He became a cinematographer in 1995, working on the films Party Girl (1995), Half Past Dead (2002), Halloweentown (1998), The Thirteenth Year (1999), and Ready to Run (2000).

In 2000, Slovis became a cinematographer on the series Ed, and worked on the series CSI: Crime Scene Investigation, New Amsterdam, Fringe, Royal Pains, Rubicon, Running Wilde, Breaking Bad, and Better Call Saul.

Later, he directed episodes of Ed, CSI: Crime Scene Investigation, Rubicon, Breaking Bad, Law & Order: Special Victims Unit, and Hell on Wheels[1] In 2006, Slovis won a Primetime Emmy Award for Outstanding Cinematography for a One Hour Series for his work on CSI.

[2] In 2014, Slovis directed the first two episodes of the fifth season of the HBO series Game of Thrones, titled "The Wars to Come" and "The House of Black and White".

[1] He is an alumnus of New York University's Tisch School of the Arts[7] and holds a BFA in Professional Photographic Illustration from Rochester Institute of Technology.