THRESHOLD is a collaborative design studio dedicated to creating experientially rich landscapes.


Located in downtown Fort Lauderdale Florida, the studio is comprised of a multi-disciplinary team with backgrounds in architecture, landscape architecture, urban design and the fine arts.


Our design and construction experience includes a range of typologies, scales, and complexities that includes a collection of intimate gardens, boutique hotels and rooftop landscapes throughout coastal Florida. We aim to connect people with their surrounding landscape through thoughtful design gestures. Our process carefully considers history, context, ecology, and materiality to improve the quality of life for humans within the built environment.


We offer a professional relationship that is personable while centered around the vision and aspirations of our clients. Through a process of collaboration and devotion to craft, our practice embraces the inherent character of each site with clarity and integrity while seeking to build a distinguished body of work that is enduring over time.

Michael Callahan
Principal Landscape Architect

Michael is founder and creative director of Threshold Landscape Workshop. He has worked with Raymond Jungles on the design of Grove at Grand Bay with Bjarke Ingels and the 200m Master Plan renovation of Bal Harbour Shops. Michael has apprenticed for renowned landscape architect Stephen Stimson in Boston and began his career with the multidisciplinary firm Kimley-Horn and Associates.


Growing up along the Florida Coast, Michael developed an appreciation of his surrounding environment while exploring the beaches, tidal lagoons, and freshwater marshes near his home. These experiences combined with his early interest in art and architecture led him to study environmental design. Through time he has developed a passionate interest in how native plant communities, sustainable management practices and vernacular building materials work to create meaningful landscape experiences. Michael has participated as a visiting lecturer at Clemson University, Penn State University and Iowa State University.


Education

Master of Landscape Architecture, Iowa State University College of Design

Bachelor of Landscape Architecture, University of Georgia School of Environmental Design


Accreditations

American Society of Landscape Architects

Registered Landscape Architect, State of Florida


Select Awards

2022 American Society of Landscape Architects National Honor Award

- Leon Levy Preserve Eleuthera, Bahamas, Project Designer with Raymond Jungles Inc.

2015 American Society of Landscape Architects National Honor Award

- Hardberger Park San Antonio, TX, Project Designer with Stephen Stimson Associates

2015 Beijing China Garden Expo International Competition Winner

Christine Sawyer, RLA
Studio Director

Christine is the managing partner involved in all aspects of Threshold project management from schematic design through design implementation. She has apprenticed for landscape architect Stephen Stimson in the design of University of Connecticut, Northeastern University and large scale residential estate projects throughout the northeast and Canada.


Christine has taught design courses at Iowa State University while participating in the Iowa Department of Transportation Living Roadway Program. During which, she has collaborated with many government agencies, business owners and local communities. From the vastness of the Iowa agrarian landscape of her youth to cities lived in and traveled Christine has learned to appreciate how inherent qualities inform place. And, how thoughtful design can shape the landscape to reflect and enhance these qualities.


Accreditations

American Society of Landscape Architects

Registered Landscape Architect, State of Florida


Education

Bachelor and Master of Landscape Architecture, Iowa State University College of Design

Bachelor of Fine Arts, University of Iowa School of Art and Art History


Select Awards

2019 American Society of Landscape Architects National Honor Award of Excellence

- Flume Fountain at Heritage Museum and Gardens, Sandwich, Massachusetts*

2013 Boston Society of Landscape Architects Merit Award

- University of Connecticut New Social Sciences Buildings, LEED Silver, Storrs, CT*

2010 Boston Society of Landscape Architects Merit Award

- Northeastern University - LEED Gold Certified, Boston, Massachusetts*

* Project Designer with Stephen Stimson Associates

Maria D'Alessandro, ASLA
Senior Landscape Designer

Maria is an accomplished design professional having a Bachelor’s degree in Architecture and recent completion of a Masters in Landscape Architecture with over 6 years of experience in commercial and residential design, interior design, and project management. Born in the Dominican Republic, Maria has also gained diverse perspectives in design while interning in New York City and Germany that she has brought back to her practice in South Florida. Maria’s expertise lies in translating concepts into visualizations using 3D modeling software and learning from senior mentors to effectively implement ideas, while also contributing her own creativity to enhance project designs.


Maria’s background as an artist with interests in woodworking, biophilic design and photography, along with her experience as trained architect has fueled her passion for creating and continuous learning in the field of landscape architecture.


Accreditations

American Society of Landscape Architects


Education

Master of Landscape Architecture, Florida International University

Bachelor of Architecture, Universidad Iberoamericana, Santo Domingo

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