David Ferguson served for 39 years in the New Brunswick public service, with more than 16 years as deputy minister. He was named deputy minister of advanced education and labour in 1994. He served as deputy minister at the Office of the Solicitor General from 1998 to 2000; as deputy minister at the former department of natural resources and energy from 2000 to 2003; and as deputy minister at the Department of Natural Resources from 2003 to 2007. He served as clerk of the executive council and secretary to cabinet from 2007 to 2010. He retired in December 2010.