[3] On December 22, 2010, Hertzog announced his intention to forgo his senior year at Penn State and become eligible for the 2011 MLS SuperDraft.

[8] He ended the season as one of USL Pro's top scorers and helped the club reach the league final.

On November 19, 2012, the Red Bulls announced it declined options for an additional six players, having released four a week earlier, with Hertzog included in the mix.

Hertzog signed with Vancouver Whitecaps FC on January 23, 2013,[9] and scored his first goal for the club on April 6, 2013, against the San Jose Earthquakes.

[10] Hertzog was released by Vancouver and selected by Seattle Sounders FC in the 2013 MLS Re-Entry Draft, but didn't sign with the club.

[12] Days later, Hertzog signed with Tampa Bay Rowdies of the North American Soccer League (NASL) on a contract through 2015 with a club option for the 2016 season.

[18] On December 10, 2020, Hertzog signed for USL side San Diego Loyal,[19] and scored in their season opening game.

The move reunited Hertzog with coaches Jay Mims and Bob Warming who he had played under while at Penn State.