MADISON, Wis.–(BUSINESS WIRE)–Singlewire Software (“Singlewire”), a leading provider of mass notification software for safety, emergency and workflow communications, today announced a strategic investment from funds advised by PSG, a leading growth equity firm partnering with middle-market software and technology-enabled service companies. PSG’s Tom Reardon, Managing Director, and Chris Andrews, Principal, have joined Singlewire’s Board of Directors, as has Barry Allen, Operating Partner and