Thomas Day is the Chief Sustainability Officer for the United States Postal Service, a position he assumed in June 2011. In this role, he leads the USPS’s ambition of being a sustainability leader by creating a culture of conservation throughout the organization, and leading the adoption of sustainable business practices.

Prior to serving in this role, Mr. Day was Senior Vice President, Intelligent Mail and Address Quality (2007-2011) and Senior Vice President of Government Relations (2005-2007). From 2001-2005, he was Vice President of Engineering.

Mr. Day is a third-generation employee who entered the Postal Service as a management associate in the Northeast Region in 1984 following five years’ service as an officer in the U.S. Army.

He is a graduate of the U.S. Military Academy at West Point, where he earned a Bachelor of Science degree in engineering in 1978. He represented the Postal Service as a Sloan Fellow at Stanford University's Graduate School of Business, where he earned a Master of Science degree in management in 1996.