PHILADELPHIA Author Hal Gullan of Mount Airy will sign his book Tough Cop: Mike Chitwood vs. the Scumbags with Upper Darby Police Superintendent Mike Chitwood at noon Tuesday at the Rittenhouse Square Barnes & Noble, 1805 Walnut St.

Gullan is the author of several books on local history. Chitwood is a former Philadelphia homicide detective and hostage negotiator.

- Aubrey Whelan