In over three years as an eMarketer senior analyst, David Hallerman has written 25 reports on advertising and marketing issues. His recent studies of industry trends and forecasts look at search engine marketing, online ad targeting, e-mail marketing, ad spending online and offline, and rich media usage.

Print and Internet media, such as The Wall Street Journal, The New York Times, USA Today, Business Week, MediaPost, and Advertising Age, interview Hallerman frequently. He has discussed online advertising and technology developments as a guest on several television shows, including Wall Street Week with Fortune (PBS) and Morning Call (CNBC); and he has been a speaker at such events as the Direct Marketing Association's DM Days, Ad:Tech, the TWST conference, and NetFinance.

Before coming to eMarketer, Hallerman edited business magazines at Forbes Custom Publishing, including Executive Edge for Gartner Inc. and Critical Mass for the Interactive Advertising Bureau. Before that, he was senior editor at Bank Technology News, focusing on Internet banking and financial services, and senior editor at Home-Office Computing, concentrating on small business usage of technology.