Mike Sullivan

Mike Sullivan is the President and CEO of LOOMIS Agency, a full-service advertising and marketing agency headquartered in Dallas, Texas that specializes in challenger brand strategy. Under his leadership, LOOMIS has built a reputation for helping brands punch above their weight against dominant category competitors, developing the agency's distinctive 'challenger brand' positioning as a core strategic offering. Sullivan has been a vocal advocate for the challenger brand philosophy, contributing thought leadership on how underdogs can outmaneuver market leaders through smarter strategy and creative work. He has helped guide LOOMIS through growth as an independent agency in a landscape increasingly dominated by holding company networks. He is active in the advertising industry community and has spoken and written on topics related to brand strategy, agency leadership, and the competitive dynamics facing challenger brands in modern marketing.

Last updated Oct 23, 2026 by ATDb automated enrichment