An assistant secretary is a person who helps and supports the main secretary in their work. They do tasks like organizing documents, scheduling meetings, and managing important information. Full definition
While he was hired as assistant secretary for the environment in 2012, he was promoted to deputy secretary in 2013. (politico.com)
The letter, of course, was signed by the acting assistant secretary for elementary and secondary education. (educationnext.org)
«I can imagine these changes would be really good for the morale for the Chinese diplomats at the foreign ministry at a time when the morale of the diplomats in the US foreign service is at an all time low,» Susan Shirk, a former deputy assistant secretary of state for East Asia, told Bloomberg. (businessinsider.com)