Hertig played his youth football with Lausanne Sport and advanced to their first team, signing his first professional contract, under head-coach Péter Pázmándy in September 1983.
In the 1992–93 season Hertig contributed to the team reaching the final and winning the Swiss Cup.
[1] The following season Hertig moved on and signed for FC Basel, who at that time played in the Nationalliga B, the second tier of Swiss football.
[3] During that season his teammates were the likes of Swiss international goalkeeper Stefan Huber, defenders Massimo Ceccaroni, Marco Walker and Samir Tabakovic, the midfielders Mario Cantaluppi, Martin Jeitziner, Admir Smajić and Ørjan Berg and the Swiss international striker Dario Zuffi.
He worked in patrimony management in private banking, Key Clients and in the Sports and Entertainment Group for about 15 years.
In 2009 Hertig joined the Association suisse de football (ASF) as member of the central committee.
Since March 2014 he is member of the Swiss sub-section of Special Olympics and is part of the Foundation for the integration and promotion, through sport, of people with specific needs.