Terry is well known as an expert user of the genealogy program The Master Genealogist, and a frequent contributor to the on-line TMG user support forums. He is the author of "Terry's TMG Tips," a website with over 100 "how-to" articles on the use of the program and Second Site, the companion program which produces websites from TMG databases. He has written several articles about TMG for newsletters published by user groups and two chapters in the book "Getting the Most Out of The Master Genealogist," directed toward more advanced users. He has more recently authored the sell-out book "A Primer for The Master Genealogist," which has been well received by both beginners and experienced users a like.