Our practice is comprised of a talented and qualified staff of landscape architects and administrators with over 30 years of combined experience.  Our mission is to provide personalized and professional service to each of our clients.

Sandra Youssef ClintonFASLA is President of Clinton & Associates, PC.  She has been a practicing landscape architect since the completion of her Master’s Degree from the University of Virginia in 1984.  In 1980 she received her Bachelor of Science Degree in Plant Science and Horticulture from the University of Delaware.  She is registered as a landscape architect in the states of Maryland and Virginia, and is CLARB certified to practice in all fifty states.  Sandy was elected a Fellow in the American Society of Landscape Architects in 2005.  Prior to founding her own firm in 1998, Sandy was a Senior Associate with Oehme, van Sweden and Associates, Inc. 

Throughout her career Sandy has taken a hand’s-on and personal approach to her work.  She participates in all aspects of design, field measuring, site analysis and layout of plant materials on her construction projects.  She works hand-in-hand with her clients to understand their needs and desires, and communicates openly and fully to assure a successful end result.  Her particular expertise, beyond design and proportion of outdoor space, is her knowledge of plant materials, which is realized in the richness of plant combinations in her finished works.

She is an articulate communicator and strong leader who stays involved in all aspects of design and management for each project.  Sandy’s creative abilities have positioned her as prime lead on many collaborative teams of designers, consultants and contractors, and she is responsible for timely and on-budget requirements.

Lauren Fisher is an Associate Landscape Architect, aiding in design, detailing, master planning, and planting designs for commercial projects, and assisting with coordination of contractors and general contracting services on the residential side of the firm. Lauren holds a Bachelor of Landscape Architecture from Virginia Polytechnic Institute.






Mary Ann Allison is the firm’s Director of Administration and Marketing.  With a Bachelor’s Degree in Communication Arts and Design from Virginia Commonwealth University, Mary Ann contributes to the development of proposals, as well as media and public outreach, in addition to her lead financial and administrative responsibilities with the firm. She is a former design associate with David Pesanelli & Associates of Washington, DC, where she specialized in large-scale commercial and governmental signage and exhibit design.