SGA is a collective studio of landscape architects, architects, engineers, planners and urban designers. We focus on ways to improve the human and ecological environment through innovative and collaborative design.


Stromberg/Garrigan & Associates is a multi-disciplinary and collaborative planning and design studio. We offer comprehensive landscape architecture, urban design and planning services primarily focused on the revitalization and redevelopment of communities. 

Our Focus

A primary focus of the firm’s work is the clean-up and revitalization of brownfield and environmentally contaminated properties.

Whether to attract private investment through the development of new buildings or the creation of new public resources, such as parks and public spaces, SGA works closely with our clients to develop viable and implement-able solutions that transform community liabilities into treasured assets.

Our well proven planning and design approach advocates a comprehensive community public involvement process. The utilization of a broad range of public involvement tools, developed through our extensive project experience, is one of the fundamental keys to our success. It allows us to foster projects to successful completion and is a major motivating factor that aids our clients’ in achieving their goals for success as well.

Our Philosophy

The foundation of how we work is the fundamental understanding of the operation of natural systems and their inter-relationships with the human environment.

We employ a broad set of sciences and analytical constructs to form a chronological understanding of a place’s evolutionary history and to understand the inherent and existing qualities of a place.

Our concern is not with science for its own sake but rather for the essential knowledge needed to intervene on a site in a meaningful way.

SGA’s approach does not rely on compartmentalized disciplines operating independently as in orthodox community planning and traditional design. Instead, we respond to what we believe comprise the unique attributes of a place, typically derived from nuanced inter-relationships between many forces.

Effective planning and meaningful design cannot occur without understanding the implications of physical, environmental and social factors at work and revealing the systematic relationships of people and place; hence revealing the capabilities, opportunities and constraints of a site and thus the potential distinctive hypothetical future. From this framework, SGA’s designs harness dynamic processes to establish creative solutions which are sustainable and diverse.

Our planning and design techniques engage complex systems and constructs in order to redefine a space, a place or a region in a forward thinking, holistic manner and in doing so, our projects serve as comprehensive solutions that provide the highest level of creativity in order to meet or exceed our clients’ goals and expectations.

Total Project Area
1,138 Acres
Phoenix Award Winning Firm

Our Work


View some of SGA’s recent projects to learn more about our approach.

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SGA offers comprehensive landscape architecture, urban design and planning services.

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Our People

  • Timothy Stromberg
    Principal, PLA, CBLP, ASLA
  • Sean Garrigan
    Principal, RLA, AICP, ASLA
  • Mike Fox, PLA, ASLA
    Landscape Architecture Practice Leader
  • Kate Cerone
    Director of Design Communications
  • Michael Stromberg, PE
    Professional Engineer
  • Ashlie Ranhorn
    Office Administrator
  • Phillip Wu, AICP, LEED AP BD+C
    Project Planner
  • Anna Withrow Leisher
    Project Planner
  • Jessica Stuck, AIA, CCS, CDT, LEED AP
    Architecture Practice Leader
  • Michael Friedhofer, RA, AIA
    Director of Architecture
  • Feifei Huang
    Landscape Designer
  • Hejing Feng
    Landscape Designer
  • Mandy Stamnitz
    Landscape Designer
  • Becky Weyant
    Administrative Assistant
  • Brooke Burnette
    Brooke Burnette
    Graphic Designer


We place special emphasis on fostering creativity in the workplace and our team of professionals possess a passion for what they do every day and on every project.

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