(DNAINFO)  Shaye Weaver —  When he’s not working as a scientist at Columbia University, Chris Grigsby spends his weekends setting broken bones and responding to drug overdoses in Central Park.

While the city’s fire department and other hospitals might respond to emergencies in the general area, a little-known group of EMTs called the Central Park Medical Unit, which is run strictly by volunteers with day jobs, focuses on keeping the 843-acre park and its surrounding streets safe, and does it for free.

Source: Little-Known EMT Group Responds to Emergencies in Central Park for Free – Upper East Side – DNAinfo.com New York