Chandler's appointment is part of a C-suite reorganisation by newly-appointed chief executive, Jon Mew.
"We are at a point in digital’s growth where inspiring and engaging brands is just as important as addressing the industry issues," Mew said. "James has the critical experience of working up close with clients, so he’s perfectly placed to put their views at the heart of our communications and outreach."
The move will see the team split into three clear functions. Besides communications and outreach, IAB's Tim Elkington, previously chief strategy officer, becomes chief digital officer and is tasked with prioritising key industry issues across ad tech and from a regulatory perspective.
Alex Kozloff, formerly director of marketing and industry engagement is appointed chief operating officer. She will focus on the outputs of the IAB across research, events and the newly established industry initiatives team.
"Tim and Alex have a combined 14 years at the IAB under their belts and every day they demonstrate razor sharp focus to build the IAB’s future. James’ industry experience is the perfect complement to complete the top team," Mew added.
Chandler, who prior to joining Snap was global mobile director at Mindshare, said he was "completely sold" on Mew's vision: "The IAB has always played such an important role in my career and I've been able to see first-hand the positive impact it has had on brands, agencies and media partners."
He will join the IAB later this month.
His appointment follows that of Roisin Donnelly, the former Procter & Gamble marketer, to chair its new advertiser steering group.