While in high school, he participated in Pennsylvania Keystone Boys State, an American Legion leadership program.

[6] He graduated from the United States Naval Academy in 1975 with a Bachelor of Science degree in ocean engineering and completed studies in nuclear power for service as a submarine officer.

In July 1997, Greenert reported as chief of staff for Commander, United States Seventh Fleet, in Yokosuka, Japan.

[3] At NBR, Greenert brings to bear his years of experience in the U.S. Navy to help inform policy debates on critical issues pertaining to the Asia-Pacific through briefings of senior leaders, and research and writing.

"Admiral Greenert brings a wealth of knowledge and expertise from a distinguished, 40-year career as a senior military officer and government leader," Chertoff said in a statement.