On the heels of Vincent Chalvon-Demersay’s exit as CEO of Zodiak Media-owned Marathon Media in November, co-founder and general manager David Michel is set to leave the company effective March 31.

The move follows an ongoing shake-up of top executives at Marathon Media, which saw Marc-Antoine d’Halluin replace Michel as Zodiak Media CEO in October and take over as temporary acting president and CEO of Marathon Media after Chalvon-Demersay’s exit.

d’Halluin will temporarily head up the Paris-based animation company, with COO Ambroise Delorme and CCO Eryk Casemiro.

When reached for comment, a Marathon Media representative said no one is expected to replace Michel or Chalvon-Demersay to date.

After 15 years with the company, Michel has not specified his reason for leaving, but will assist in the transition period before his departure. He co-founded the company with Chalvon-Demersay in 2001 and became GM in 2007. Four years later, he joined Zodiak Media’s executive committee as SVP of group marketing.

Michel achieved international success as the co-creator and co-producer of 13 series including Totally Spies! and Martin Mystery. His most recent production is Get Blake for Nick US and international, and Gulli in France.