Founded in 1971, O'Halloran Advertising Inc. is a full-service advertising agency. Based in Westport, Conn., the company provides an array of marketing services, such as direct mail campaign development, e-mail marketing, print production management, campaign program tracking and copywriting services. Additionally, it offers various other services, including, mobile phone services, search engine optimization, yellow page advertising and media buying, to name a few. O'Halloran Advertising Inc.'s client base includes Direct Energy, Gym Source, Papa Gino's and Catherine's Choice. .