IAG Research, the TV ad-effectiveness ratings company in New York, has hired Rachel Mueller-Lust as senior vice president of its network division. Mueller-Lust will focus on the network sector of IAG's business that currently represents CBS, Fox and NBC. She joins IAG from ABC, where she was vice president of sales research. While there, Mueller-Lust was the strategic and operational leader of the research division in support of network sales, including television and interactive properties. Prior to that, she was vice president of methodology research at Nielsen Media Research.