One Call Concepts, Inc. 7223 Parkway Drive Suite 210 Hanover, MD 21076 President Tom Hoff (410) 712-0082 Chief Operations Officer Susan Volkman (651) 430-1206   Chief Financial Officer Mike Horne (410) 712-0202 Director of Systems Division Randy Peterson (414) 259-1047   Controller Dan Florenzo (410) 712-0082   home / about us / services / locations / in the news / events / employment / contact © 2010 One Call Concepts, Inc. All Rights Reserved.