From New Jersey:

Take Delaware EXPY/I-95 N toward Princeton to PA-332 exit EXT49 toward Newtown/YardleyTurn left onto Newtown BYP/PA-332 W. Continue to follow Newtown Bypass.Stay straight to go onto SWAMP RD. Turn Left onto Worthington Mill RD. 374 Worthington Mill Rd is on the left.

From Philadelphia:
Take I-95 N to Street Rd exit EXIT 37, toward PA-132
Turn left onto STREET RD
Turn Right onto @ND ST PIKE/PA 232
Turn Right onto Worthington Mill Rd374 Worthingon Mill Rd is on the right