His documentary films include Monster Camp (2007), Terms and Conditions May Apply (2013), and What Lies Upstream (2018), as well as the HBO mini-series Q: Into the Storm (2021).

[16] Hoback also held a screening in Washington DC for a number of high-powered officials and policy-makers, hosted by Congressman Justin Amash.

[6][18] In 2018, Hoback theatrically released What Lies Upstream, a feature documentary focused on scientific regulatory agencies, and the government oversight of drinking water safety.

[19][5] The film questions whether the Flint Water Crisis and the Elk River Chemical Spill, are outliers or signifiers of a nationwide scandal.

[18][5] On December 25, 2013, Cullen Hoback and Ondi Timoner released a lengthy conversation about how the surveillance situation has evolved since her film, We Live in Public.

In an interview with The Guardian earlier that month in December 2013, Hoback commented that whistleblower Edward Snowden should be granted immunity by the US government.