The terms of the acquisition were not disclosed.
Looking for creative help
Avenue A, whose clients include AT&T Wireless, Best Buy Co. and Microsoft Corp., was looking for creative capabilities to help it in attracting new business.
"I-Frontier is profitable and has capabilities we don't have," said Brian McAndrews, Avenue A president-CEO.
I-Frontier founder Brad Aronson will remain president of the 58-person agency, which will also keep its name. No layoffs are planned, Mr. Aronson said.
The agency's clients include AstraZeneca, Novartis and Wyeth and is one of the biggest buyers of online media in the health care and pharmaceutical segments, according to Forrester Research.