The Marses paid for most of the Deborah Clarke Mars Education Center construction but left before it was finished. They did not attend the center's dedication earlier this month.
Mr. Mars said they might consider coming back if the fort had new leadership but didn't know if they would be welcomed.
The fort's Board of Trustees has set up an executive-director search committee, headed by Calvin Staudt, a former International Paper Ticonderoga mill manager.
The committee has $100,000 in dedicated funds previously donated by Mr. Mars.
Some members of the Board of Trustees wanted Westbrook to announce his retirement after the fort's annual meeting earlier this year. He did not do so, instead saying he wanted to stay.
Westbrook said gloom-and-doom stories about the fort leave out what the Mars Education Center represents.
"The missing story is an incredibly dramatic transformation at Fort Ticonderoga. It leaves us stronger than ever."
Transformation of the fort from a seasonal institution to a year-round facility was the key concept the center made possible, he said.
"This is really a huge leap for us into the 21st century. It's the first green' building to be built in Essex County. It's heated and cooled by geo-thermal wells."
It means visits by more school groups and more educational programs at the fort, he said.
"There's a whole lot going on here that's exciting."