He met the couple when they made a cabernet at his winemaking facility right after it opened in 2008, he said. He keeps up with their exploits through their website and blog.
While the Sullivans' aim is to reach out to the ordinary person, "they're far from ordinary," Zuchero said.
"Being able to travel around the world like they do is pretty cool," he said. "But they want people to learn to drink wine without pretense."
Terry said their goal is to empower people to decide for themselves what wines they like.
"We shy away from anyone scoring wines," he said. "We just want people to feel better about walking into a wine-tasting room."
To that end, "A Wine Tourist's Guide" covers tasting room expectations and etiquette. Readers will find a wine tasting form, a discussion of common grape varieties and suggestions on how to plan a winery trip.
The couple's third book will focus on wine's 8,000-year history.
"For a long time, I thought winemaking began 4,000 years ago in Italy, France and Greece," Terry said. "But it actually began 4,000 years before that in the country of Georgia."
The Sullivans are making a white wine in Georgia in a qvevri, which is a clay vessel where wine ferments that can have a capacity as large as 2,000 liters. Their 60-liter qvevri was buried underground to maintain a constant temperature for the grapes.
Terry hopes their wine — which they will retrieve when they return to Georgia in March to attend the sixth annual International Wine Tourism Conference — will have floral and dried-fruit flavors.
"We expect it to be dark amber in color, since the grapes' skins, seeds and all went into it. Or it could be terrible," he said jokingly. "But we cleaned and sanitized the qvevri as best we could. Cleanliness is the universal challenge of winemaking."
Another of the Sullivans' coming projects will be a collaboration with Harvest Ridge Winery, which just opened Nov. 1 in Marydel, Del., west of Dover. The winery sits on the Maryland-Delaware border — hence the name of the small town — with 80 acres in each state.
Winery owner Chuck Nunan, who has been an amateur winemaker for 15 years, said his family-run operation is working with the couple to offer four classes sometime next year. Announcement of the dates is set for December.
"Terry and Kathy are a super neat couple who agree with me that wine is a personal choice," he said. "We want to help people understand wine, though, so we will be putting them through the paces."
The Sullivans said they are pleased with their progress in the mission to bring wine education to ordinary folks, and that their oldest daughter's recent post on Facebook let them know they're on the right track.
"Erin posted, 'My life is so cool right now, but what my parents are doing is way cooler,' " Terry said, laughing. "That said it all."