Incorporated in the fall of 1999, Fielder & Callahan, LLC is a partnership dedicated to the production of artistic and creative stonework with a traditional approach to methods of construction and design. David Fielder and Travis Callahan received their Master Craftsmen Certificates from the professional Dry Stone Walling Association of Great Britain (DSWA-UK) in the summer of 2002 after a rigorous exam. The achievement was a culmination of several years of work during which they received their Initial, Intermediate and Advanced Certificates prior to receiving their Master Craftsmen Certificates. The partnership exemplifies the ancient art of walling of each location. The team has an extensive portfolio of projects in the Upper Valley, as well as more elaborate estate work in Nantucket where they often work in the winter months.

Fielder & Callahan's stonework has a wide range of influences including the ancient dry stone walling techniques of Great Britain , as well as farm walls in New England. In addition, each member brings academic focus which plays in the conception, execution and completion of each project. The team is dedicated to the education of the public in the techniques and traditions of dry stone walling. They have participated in public demonstrations at the Quechee Scottish festival, the Southern New Hampshire Scottish games and Celtic Music Festival. Fielder & Callahan have traveled travel to Scotland to continue their education in dry stone walling by studying under resident Master Craftsmen Dave Goulder, George Gunn and Bruce Curtis.