Our mission is to be the obvious choice to design a signature project for a discerning client. OUR STAFF Greenline's Principals are: Monica D. Mastrianni, AIA, LEED AP. Robert J. Poticny, AIA. John L. Deering, Brian K. Felder, AIA, LEED AP. Within the firm we have specific design studios specializing in custom residential, historic preservation, educationaland healthcare design. residential and/or commercial interiors.