Members of the Menlo boys lacrosse team received a notification on Sept. 22 that William Mark, a professional goalie for the Premier Lacrosse League’s (PLL) New York Atlas, would become their head coach.

Over the summer, Blake Kim, previously the boys lacrosse head coach for seven years, moved to become the girls lacrosse head coach. After a search committee highlighted Mark as the primary candidate, he was interviewed by members of the lacrosse team and Head of School Than Healy before being hired.

Athletic Director Earl Koberlein believes Mark will be a great addition to the boys lacrosse program. “It’s exciting to see his passion. He’s so excited about building a program, a program that we could be proud of and he could be proud of. [He] wants to be here for the long haul,” Koberlein said.

Mark began playing lacrosse at boarding school in Connecticut and continued through college, first attending Long Island University and later transferring to Syracuse University. During his time at Syracuse, Mark became a candidate for the Tewaaraton Award in 2023 and 2024, which recognizes the best college lacrosse player in the nation. Last year, Mark signed with the Atlas and competed in the team’s PLL Championship-winning 2025 season. Mark is excited to coach high school lacrosse for the first time. “The more I went through the process, the cooler the opportunity got and the more excited I am to be here,” Mark said. 

He believes that his role as head coach extends beyond just making players good at lacrosse, but rather teaching them valuable lessons off the field. “We’re not chasing a professional contract for millions of dollars, we’re chasing human lessons and challenges. And we are learning to face adversity in a really safe landscape and push through that adversity in the right way, in the right setting,” Mark said. “Lacrosse can produce better humans, and I fully plan to do that as well.”