Peter Callaghan Presenting at Human Resources Association of Greater Concord’s February Meeting Share This Page When: February 18, 2016 at 7:45am – 9:45am People: Peter G. Callaghan Location: Northeast Delta Dental2 Delta DriveMaine RoomConcord, New Hampshire Peter Callaghan is the featured speaker at the Human Resources Association of Greater Concord's February breakfast meeting. Peter will present to association members on How to Handle Challenging Employees.