Siewert, 57, joins the firm from asset management company The Carlyle Group, where he serves as managing director, Asia Buyout, Consumer and Retail.
He previously worked as group President and chief operating officer, Asia, for Coca-Cola.
Mondelez chairman and CEO Irene Rosenfeld said: “With nearly half of our revenues coming from Developing Markets, Patrick's consumer expertise in international markets will be invaluable as we continue to build on our position as a global snacking powerhouse,"
"Having lived and worked in Asia for 15 years, Patrick has intimate knowledge of consumer trends, routes to market, regulatory issues and the economic challenges and opportunities across the region.”
Siewert joins nine other Mondelez board members.