Elphick grew up in England and began birding when he was big enough to hold a pair of binoculars. His research focuses on the conservation ecology of birds, especially in agricultural settings and wetlands. Along with David Sibley and Barny Dunning he edited the Sibley Guide to Bird Life and Behavior and wrote the syndicated newspaper column Sibley on Birds. He is also a co-author of the recently published Atlas of the Breeding Birds of Nevada.