Before Brunswick, David spent a decade at Business for Social Responsibility (BSR), where he was Managing Director, Climate and Nature. David worked with companies to implement credible environmental goals and programs, manage climate and nature risks, and develop collaborations to build a net-zero economy. Previously, David served the Marshall Islands and Alliance of Small Island States as a climate diplomat in the Paris Agreement negotiations. He is an international lawyer, having advised governments on international environmental treaty implementation, after working as a securities litigator with Fried Frank in New York and a commercial litigator with Cassels in Toronto.