Scott McIntosh
Managing Partner | AutoCAD Engineer | Entrepreneur
As the Managing Partner of Cornerstone Development, Scott has over 30 years of experience in the construction services and supply industry. He is also the CEO of Aqua Blue Distributors Inc. one of the Tri-State’s largest suppliers of plumbing fixtures and equipment, catering to the high-rise residential and hospitality industry in New York. Scott is accustomed to working under pressure to deliver exceptional results to his clients. Through his experience in dealing with large hi end developers for so long, he realized that there are only a handful of boutique developers on Long Island that build a quality product.
His extensive background in construction and design and entrepreneurial spirit led to the creation of Cornerstone Development Partners, a full service development company specializing in new home construction where quality is paramount. Scott’s main focus for the company is land aquisition & site development all while keeping the mission of Cornerstone Development “customer centric”.
Our sole mission to provide quality homes at reasonable prices on time and within budget all while “Building Your Lifestyle”.
Rich Guererra
Director of Construction
With over four decades of hands-on experience in the construction industry, Rich Guerrera brings a wealth of knowledge, craftsmanship, and leadership to his role as Director of Construction at Cornerstone Development Partners. Since launching his own building company in 1987, Rich has earned a stellar reputation across Long Island for delivering high-quality residential construction marked by integrity, precision, and reliability.
Fully licensed and insured in both Nassau and Suffolk Counties, Rich has successfully managed a wide spectrum of projects, including new home construction, additions, dormers, renovations, framing, roofing, and siding. His comprehensive understanding of the building process—combined with an unwavering commitment to excellence—ensures every project is completed to the highest standards.
Rich’s passion for construction and dedication to client satisfaction make him an invaluable asset to the Cornerstone team. Whether overseeing a custom build or guiding a complex renovation, Rich brings a personal, detail-oriented approach that has made him a trusted leader in the Long Island construction community.
Jennifer Lamberti
Chief Financial Officer / CPA
Jennifer Lamberti, CPA, is the Chief Financial Officer of Cornerstone Development Partners LLC, bringing over 20 years of accounting and financial leadership experience to the firm. She began her career in 2004 and spent more than nine years at Marcum LLP, where she built a strong foundation in public accounting and client services. Since 2014, Jennifer has owned and operated her own CPA practice, delivering strategic financial solutions to a diverse client base.
At Cornerstone, Jennifer leads all financial operations, including planning, reporting, compliance, and long-term budgeting. Her areas of specialization include bookkeeping, tax planning and preparation, financial statement preparation, budgeting, and business consultation. Her practical insights and collaborative approach support the company’s continued growth and financial stability.
She holds a Bachelor of Business Administration in Finance and is a licensed Certified Public Accountant.
Outside of her professional work, Jennifer is married with three children and is deeply involved in her community. She serves as Cubmaster of a local Pack, a Committee Member of a Scouts BSA Troop, a member of the Benjamin Tallmadge District Training Committee, and Commissioner of the Suffolk County Council STEM Nova Program. Through her leadership roles in Scouting America, she is committed to fostering youth development, education, and service. In her free time, she enjoys traveling and spending time with her family.
DeAnna Spector
Director of Sales and Marketing / In-house Reality Specialist
With over 15 years of sales experience and more than 12 years in the real estate industry, licensed real estate professional, DeAnna Spector brings a dynamic blend of market expertise, strategic vision, and relationship-driven insight to her role as Director of Sales and Marketing at Cornerstone Development Partners LLC.
Specializing in new construction development, DeAnna has built a reputation for driving growth, optimizing marketing strategies, and managing the entire sales process—from foundation to closing day. She is known for making the process seamless, informative, and personalized, helping clients find homes that truly meet their needs and build their lifestyle.
With strong networking skills and a deep understanding of market trends, DeAnna excels at building lasting partnerships and connecting buyers with their ideal homes. Her results-oriented approach and passion for real estate continue to fuel her success in delivering exceptional value to developers, clients, and stakeholders alike.
Matt Rebar
Site Superintendent
Matthew Rebar is a seasoned professional with more than three decades of experience in the contracting industry. As a skilled carpenter and a direct employee of Cornerstone Development Partners, Matt brings extensive knowledge and expertise to every project. His long-term experience working with various trades positions him as the ideal candidate to collaborate closely with our general contractor and vendor partners, ensuring seamless project progression.
In his role, Matt coordinates daily with management, sales teams, and subcontractors, ensuring that all project components align with client expectations and deadlines. His core responsibility is to uphold the company’s vision of “building your lifestyle,” making certain that every aspect of the project reflects the client’s vision and goals.
With a commitment to excellence and a client-focused approach, Matthew Rebar is dedicated to delivering high-quality results and ensuring successful project outcomes.
