That the Gateway shows have their magical cache is a given. But the man who has ebulliently introduced them onstage with enthusiastic pump-up panache, director of public relations and development Scot Patrick Allan, has been an indelible part of the experience, too, even starring in some of the productions.

Things change and life calls. Allan’s last appearance introducing the shows and its stars at The Gateway will be on May 12, the Mother’s Day show and fundraiser, “Confessions of a Mulatto Love Child,” starring Bellina Logan, co-hosted by Isabella Rossellini and Laura Dern.

After that, Allan is heading to Boston, where his musical and family roots began, taking the helm as artistic director of Riverside Theatre Works, in Hyde Park, at French’s Opera House in Logan Square.

There was a collective groan at the Friday performance of “Rock of Ages” when he made the announcement.

“My first show at The Gateway was in 2005 as a dancer in ‘Evita,’” he recalled during an interview in his office. “Then I did a bunch of shows as a performer. In 2009, I assisted Robin Joy Allan (Gateway’s Acting School director and founder and sister of executive artistic director Paul Allan) in the city and ran auditions. In 2011, I came on board as Paul’s assistant.”

Allan began reaching out to supporters as the face of Gateway, and his role as emcee coalesced in 2011; “West Side Story” was the first Gateway musical he introduced.

“It was my idea to be a face for the fundraising part and introducing the shows,” he said. “After it became a nonprofit (as The Performing Arts Center of Suffolk County in 2011), I chaired the galas.” That included first-rate bands and the actors performing; the galas regularly sold out.

He was 8 when the singing bug bit.

“My mother knew I liked to sing and put me into a neighborhood singing group like the ‘Glee’ kids on the TV show,” he said. “The first musical I saw was ‘The King and I,’ but it was in a vast theater and we were sitting way back. Then I attended a 200-seat community theater and saw the performance up close, and that made performing tangible,” he recalled.

He auditioned for community theaters in Boston. His parents signed him up for musical theater classes; he began performing with adults.

“I had to search outside of high school for extracurricular musical resources,” he said.

He lived in London for a year, attending the London Academy of Music and Dramatic Art, and obtaining a certificate in Shakespeare theater.

After that, it was on to Shenandoah Conservatory Arts Academy, where he opted for a Bachelor of Fine Arts in Musical Theatre program.

Right out of graduation, he was signed to perform the U.S. National Tour of “Grease” with Frankie Avalon.

“I was able to move to New York in 2005 and got my Actors Equity card in 2006. I was lucky.”

But luck comes to those who work hard, and Allan did. “It was ‘just move forward.’ I was told ‘no’ a lot, but I just kept going and found people saying ‘yes,’ and took small opportunities. Also, my parents were supportive.”

The Allan family still are, and have always been, a friendly presence at all the shows and galas.

With a pervasive, upbeat attitude, you’d never know if he had a bad day, and his camaraderie with office and cast members is always evident as are affectionate greetings to patrons in the lobby when excitement is building.

It’s always, “Hi hon,” with a hug.

What were Allan’s favorite parts of the job?

“I enjoyed bridging the gap between the actors and the public, including the media interviews, to show the community the work that’s involved.”

(Allan always escorted this journalist through the annual Haunted House. I screamed anyway!)

“And taking the stars to community and special events. It’s fun work.”

He will be missed, said Paul Allan.

“Scot was instrumental in building a base of donors and supporters that have become so important to our structure and financial stability,” he pointed out. “Together we have worked on so many shows in so many ways—from marketing campaigns, to crazy and out-of-the-box press events, to luxurious galas. Scot has become like family. I will miss him for sure, but excited for the great opportunities that lie ahead.”