Bob Miller, who took over as group publisher of Workman Publishing in March 2010, will leave the company April 5, Carolan Workman announced to the staff in a memo today. In addition, Carolan said that company founder Peter Workman’s health “will not allow him to return to Workman in any significant capacity.” For the immediate future, the memo said, Susan Bolotin will serve as acting publisher of the Workman imprint.

Bolotin will be part of a small management team of people “who have been a mainstay of Workman’s success over the years,” the memo said, noting that Carolan, Peter’s wife and his daughter, Katie Workman, will continue to be active participants in the company. Both women have held various roles at the publisher over the years.

In a statement, Miller said “I’m very sorry to be leaving Workman. It’s a remarkable company with a staff I’ve grown to love over the past three years. I’m only sad it won’t be longer." In the memo, Carolan Workman credited Miller with overseeing the continued health of the company. His achievements included developing and expanding Workman’s digital department, making smart hires, solidifying the marketing department, helping to oversee the launch of the new Algonquin Young Readers imprint and the relaunch of Brain Quest.

Miller will consult with Workman until June and after April 5 will be reachable at