A graduate of Long Island University Southampton, Ann Blackmore holds a Bachelor of Science degree in Marketing/Management and has been employed by Summerhill since 2003. Formerly Vice President at the Bridgehampton National Bank, Ann’s deft management and long experience renders Summerhill’s reputation not only as an accomplished landscape company, but also as an organization with business integrity and careful strategic growth.
A native of Ireland, Declan Blackmore founded Summerhill Landscapes on the East End of Long Island in 1993. Passionate about plants and working in nature, he established his boutique company to create beautiful and enduring gardens. His reputation and collaborative spirit attracts top landscape architects, architects, designers, and engineers.
Declan is a graduate of Kildalton College of Horticulture, which is located in the striking Suir Valley. In addition to his vibrant, innovative practice, he has a unique mentoring and internship program for horticulture students from around the world.
Declan lives with his wife and three children in Southampton.
Brendan O’Dwyer brings a deep experience in the landscaping industry to Summerhill, where he has been employed since 1997. Among other responsibilities, Brendan helped develop and manages Summerhill’s coveted internship program. Prior to relocating to the United States to join the Summerhill team, Brendan graduated from Kildalton College of Horticulture, Ireland and worked extensively in the British Isles.
Brendan lives in Hampton Bays with his wife and family.
As a leading member of the Summerhill team, Eddie oversees all aspects of the landscape construction operations team at Summerhill. He graduated from University College, Dublin, Ireland and holds a Bachelor’s degree in Landscape Horticulture. He previously worked in Ireland before bringing his expertise and oversight to Summerhill. Active in his community of Sag Harbor, he is a member of the Village Planning Board & Havens Beach Watershed Delineation and Conveyance Committee, and supports landscape projects beneficial to the community.
Tom spent over a decade as a practicing ISA Certified Arborist on the east end of Long Island prior to moving over to the landscape construction team for Summerhill. He oversees Summerhill Associates landscape construction and maintenance operations in New York City, the Hudson Valley, and Connecticut. A graduate of St. Michael’s College in Colchester, Vermont, he earned a Bachelors Degree in Political Science in 2002. He joined Summerhill in 2013.
Tom serves on the Cultural Landscape Foundation Stewardship Council, LongHouse Reserve Garden Committee, and the Cornell Cooperative Extension Nursery/Landscape Advisory Committee.
Peter relocated to the east end of Long Island in 2009 to begin his career with Summerhill after being accepted into our unique internship program. A native of Cork, Ireland, he holds a Bachelor of Science degree in land management from Waterford Institute of Technology. He is also Captain of the Southampton Fire Department.
Dawn Schlegel joined Summerhill Landscapes in January 2023 as the Chief Financial Officer. She has over thirty years of accounting experience in both the public and private sectors. Prior to joining Summerhill Landscapes, she worked for 16 years at Emil Norsic & Son, Inc. She became a CPA in 1993 after graduating from Hofstra University in 1991.
Michael Donnellan is the senior landscape designer at Summerhill Landscapes. A creative and keen plantsman, he directs the in-house design team. A graduate of Kildalton College, he joined the company in 2000. Michael spent time working in the industry in the Netherlands and England before settling in the United States. Michael and his team are passionate about building relationships with their clients, collaborating with them in building their unique landscape oasis.
Enrico joined Summerhill in 2017 after studying and working in Venice, Paris and Florence. He holds a bachelors degree in Architecture from IUAV University of Venice and a Master degree in Landscape Architecture from University of Florence.
Joining Summerhill in May 2024, Jeff came to us with an impressive background in purchasing and logistics for the aerospace and pharmaceutical industries. He brings a nuanced understanding of shipping, purchasing, and equipment management to the greener world of landscape construction.
Harymir brings extensive experience in managing high-end residential and commercial construction projects. She has overseen projects from planning through completion, with a strong focus on budget management, subcontractor coordination, client relations, and maintaining high-quality standards in the field. Harymir manages projects from start to finish, coordinating with field teams and subcontractors, and ensuring Summerhill’s standards of quality and execution. She joined in 2026.
Lauren originally joined our team in 2019 as part of our internship program. She then completed a BS in Landscape Architecture from University College Dublin. Lauren spent three years at a Dublin-based landscape architecture firm while also completing a post-grad diploma in Project Management from UCD. Drawn to the full project management life cycle, she relocated from her native Ireland to the East End, joining Summerhill in May 2023.
Jen holds a degree in business administration from Pace University. She comes to Summerhill with six years of experience in human resources, operations, and employee relations, supporting both field and office teams. Before joining in April 2025, Jen worked in recruitment across a range of industries.
Tatiana is an all-around asset to the Summerhill team. Before joining in 2022, Tatiana worked as an office assistant at a Hamptons pool company where she coordinated scheduling and issued contracts for a fast-moving seasonal business. A former camp counselor, after-school program coordinator, and assistant teacher, her strong people skills and sunny disposition help keep the office humming. Tatiana holds an associate’s degree in Applied Science – Interior Design from Suffolk County Community College and a bachelor’s degree in Youth Ministry from Moody Bible Institute.
Jhon joined Summerhill in 2014 as a landscaper and soon transitioned into irrigation. He currently leads our irrigation unit. Originally from Colombia, Jhon has been living and working on the East End for over a decade and worked with luxury hospitality and golf courses before joining the Summerhill team.
Elena holds a degree in Accounting and has over 16 years of experience in finance, vendor management, and process improvement. She brings a strong background in financial reporting and operational efficiency gained from working with international companies in Canada and Europe. She joined Summerhill in February 2025.
Suzanne began her career at Summerhill as an intern in 2013. A standout intern, she was brought on as a full-time crew member and promoted to a crew leader in 2016, Maintenance Supervisor in 2017, and Maintenance Account Manager in 2019. In 2020 she returned to her native Ireland working as a maintenance manager for a high-profile nursery while also training as a florist. She received her florist certification in 2021 and returned to Summerhill in 2023 as our Flower and Garden Enhancement Manager. Suzanne holds a BA in Agricultural Science from University College Dublin and an MA in Business from Technological University Dublin.
With over four decades of hands-on gardening experience, Laurie brings deep knowledge and passion to her work, focusing on cultivating beautiful, productive vegetable and herb gardens using regenerative and organic methods. She joined Summerhill in 2021.
Ryan holds a BS in Horticulture from South East Technical University and worked in garden maintenance in Dublin, Ireland before relocating to Long Island. He joined Summerhill Landscapes in 2020 as part of our internship program, gaining experience in the field. He then worked as a Foreperson, Junior Account Manager, and is now a Senior Account Manager.
Loretta has eight years of experience in property management, operations, and customer relations, as well as a background in the construction industry. She holds a BA from St. Francis College and an MA from Fordham University. Loretta joined in February 2024.
Paddy holds a bachelor’s degree in horticulture from ITB Blanchardstown College Dublin in Ireland. Prior to coming to the United States, he worked in Europe for over 20 years as a landscape project manager and irrigation manager. He also holds a certification from Ohio State University in turf grass management.
Christian joined Summerhill in 2019. He has a certificate in arboriculture from Green School at UMass and a certificate in Living Landscapes from Cornell Cooperative. He is also a certified applicator and PHC coordinator. Before joining Summerhill, Christian spent ten years as a foreman for a local property management group. He is a native of San Jose, Costa Rica.
Emma joined Summerhill Landscapes in August of 2024 after earning her Bachelor of Landscape Architecture (BLA) from SUNY College of Environmental Science and Forestry. A Long Island native, she previously contributed to planting design, greenhouse production, and trail restoration at Planting Fields Arboretum State Historic Park in Oyster Bay. At Summerhill, Emma enjoys the dynamic blend of creativity and hands-on implementation that brings architectural plans to life.
Originally from Mexico, Adrian began his career in water management at his hometown’s municipal water office, where he managed user payment records and handled daily cash reconciliation of both incoming and outgoing funds. He joined Summerhill in 2012.
Larrin brings hands-on experience in coordinating orders, managing inventory, and working closely with distributors and internal teams to ensure timely, accurate fulfillment. She plays a key role in sourcing, ordering, and managing plant material and hard goods to ensure projects are completed efficiently and with the best possible materials. Larrin joined Summerhill in 2026.
A project manager for the landscape construction team, Julian has worked in the landscape industry since 2007, and joined Summerhill in 2017. A native of Mexico, he has been in the US since 2000. Julian has a natural ability to transform the landscape via operating machinery and executing complex construction plans.
Conor is from Carlow Ireland and received a BS degree in Horticulture from Waterford Institute of Technology. He joined Summerhill Landscapes in 2013, starting as an intern with our landscape construction team before bringing his talents to the maintenance department as an account manager.
Thomas supports our arboricultural operations and plays a key role in ensuring the consistent delivery of high-quality tree care and horticultural excellence. He brings several years of experience in crew leadership, technical rigging, pruning, removals, and comprehensive tree care. With a background in both residential and commercial environments, he is skilled at executing complex tree work. Thomas joined Summerhill in 2026.
Christina joined Summerhill in March 2023. Christina has a strong background in the administrative side of landscape construction. Before joining Summerhill, she was Office Manager at Paul LI Landscaping and a bookkeeper for Bill Fox Grounds Maintenance. She holds a bachelor’s degree in Business Management from DeVry University.
An East End local, Val joined Summerhill in January 2024. She attended Baruch College and is a graduate of East Hampton High School. Her background in high-end retail, a warm demeanor, and eye for detail make her a welcome addition to the front office.
James holds a Bachelors of Science degree from Waterford Institute of Technology in Ireland, where he graduated with honors in 2018. Originally an intern, James started working full time for Summerhill Landscapes in December 2019.