
Webster reports to managing director Damian Butt and will oversee the commercial operations of the company's 20 print and website titles.
Webster spent about 10 years at Emap, which was acquired by Bauer for £1.14bn in February this year, where he undertook a variety of roles including running the sales operations of FHM.
Imagine Publishing was set up in 2005 by Butt and Mark Kendrick, who left Highbury House and their respective roles of editorial director and art director in 2003.