In retirement , Knowlton served as a Senior Fellow at the National Defense University , lectured at the Armed Forces Staff College , served as an advisor for the Defense Nuclear Agency .
Was a member of the Defense Intelligence Agency Science and Technology Advisory Board .
In retirement , Knowlton served as a Senior Fellow at the National Defense University , lectured at the Armed Forces Staff College , served as an advisor for the Defense Nuclear Agency , and was a member of the Defense Intelligence Agency Science and Technology Advisory Board .