Castro brings leadership experience, community focus, and a deep commitment to innovation and inclusion.
Lonna Castro has been named the new Director of the Mastics-Moriches-Shirley Community Library—a familiar face to many in the community. She has held senior leadership roles at MMSCL in recent years and previously served as director of the Quogue Library. She brings a strong background in library administration, facility planning, and community partnership development to her new position.
Castro succeeds Kerri Rosalia, who led the library for 18 years and was instrumental in completing three major capital projects: the rebuilding of the main branch in Shirley and the creation of new annexes in Moriches and Mastic Beach.
“On behalf of the Board of Trustees, I want to extend our heartfelt thanks to Kerri Rosalia for her many years of dedicated service to our library and our community,” said Joe Maiorana, trustee president. “Kerri helped guide MMSCL through the pandemic and oversaw a transformative three-site building and renovation effort. As we move into the future, we’re thrilled to have Lonna Castro step into the director role. Her deep roots in our library, strategic vision, and inclusive leadership make her the right person to lead us forward.”
Castro began her administrative career as director of the Quogue Library and held senior positions at the Montauk Library and the Bayport-Blue Point Public Library. At MMSCL, she has overseen operations, budgeting, staffing, and facilities, playing a central role in the library’s recent growth and modernization.
“I’m honored to have been chosen to lead MMSCL into its next era of service and innovation,” said Castro. “This library has always been a cornerstone of the community, and I look forward to working with our talented staff and dedicated patrons to expand our programs, deepen our connections, and ensure that our library continues to evolve in ways that meet the diverse needs of our residents.”
Castro, a Hampton Bays resident, is known for her commitment to inclusion. In response to the library’s growing Spanish-speaking population, she has been learning Spanish to better engage with all residents and foster a more accessible environment. Her community outreach work has included collaborations with the Quogue Wildlife Refuge and Red Sneakers for Oakley, a national nonprofit that promotes food allergy awareness. She has also supported literacy-focused efforts and events throughout the East End.
Known for her collaborative leadership style, Castro fosters innovation and encourages professional growth across her teams, helping to ensure that MMSCL continues to evolve as a dynamic, future-ready institution.
For more information about the Mastics-Moriches-Shirley Community Library and its programs, visit www.communitylibrary.org.