David G. Stoeffel was named senior managing director by The Ziegler Cos. Inc., Milwaukee, a new position. Mr. Stoeffel will be group head of the asset management group and North Track fund family, overseeing the administration and operations of each unit. Brian Andrew, the chief investment officer, will continue to run investment operations at the asset management unit, and Robert Tuszynski remains president of the North Track Funds, said Cynthia Johnson, a Ziegler spokeswoman. Mr. Stoeffel was senior vice president and director of mutual fund marketing and administration at Nomura Asset Management U.S.A. Inc., New York. Rita Braithwaite, a Nomura spokeswoman, did not return a call regarding Mr. Stoeffel's replacement.