David Vonderhaar, one of Call of Duty's most veteran developers, has left Treyarch and Activision entirely. Vonderhaar, who started at Treyarch in October 2004 and had been there ever since, is leaving the company to "explore new opportunities."

Posting on LinkedIn, Vonderhaar said he is "immensely grateful" to his teammates at Treyarch "for the time we invested to improve our craft, never sitting on successes, and always wondering how to improve what we design and how we produce it."

Vonderhaar was Treyarch's studio design director and was on the leadership team at the company. He started at Treyarch in 2004 and started his career there with 2005's Call of Duty 2: Big Red One.