Senior Associate

Born and raised in Milan, Andrea Ermolli obtained his Masters in Architecture from the Milan Polytechnic University. He moved to Seattle in 2001 to work with Stephen and has participated in many large residential projects involving new construction as well as remodel work. In his spare time, Andrea cultivates his hobby of astrophotography.






Tomoko Okubo holds a Bachelor of Architecture and Minor in Interior Architecture from University of Oregon. She was Principal Architect at O H Architecture in Portland, OR before relocating to Seattle and joining Stephen Sullivan Designs. Tomoko has been a practicing Architect for 20 years and has designed a variety of projects from commercial to mixed-used buildings. In the last ten years she has been focused on designing residential projects.  Outside of the studio she enjoys spending time in nature, hiking or skiing.






Architectural Drafter

Peter Sweeney received his Bachelors of Science in Engineering Mechanics – Aeronautics from the University of Wisconsin.  Peter is a designer, engineer and draftsman who enjoys exploring the bridge between design and creation.  He strives to employ the latest building techniques to defy existing construction limitations and has contributed toward projects involving marine, aerospace, and industrial design.  When Peter is not pushing boundaries in the studio, he enjoys doing so in the mountains.






Assistant in Landscape Projects

Quill’s affinity for horticulture and garden design grew from a childhood spent gardening alongside her mother and exploring the woodland flora of the Cascade Mountains. Quill received her BA in Biology focused in plant sciences from the Colorado College, and her MS in Public Horticulture form the Longwood Graduate Program and the University of Delaware, where her studies focused on the preservation of historic gardens and landscapes. Most recently she planned and directed the preservation of the 130-year-old historic estate gardens at Meadowburn Farm on the border of New York and New Jersey.  In addition to her involvement at SSD, she serves as the Director of Historic Preservation at the E. B. Dunn Historic Garden Trust.





Shelly Leavens bw

Office Manager

A Pacific Northwest native, Shelly Leavens has lived in Seattle since 2006. She has a Bachelor’s in Anthropology, a Bachelor’s in International Studies and a Minor in German, all from Penn State University. She received her Master’s in Museology from the University of Washington in 2009 and joined Stephen Sullivan Designs in 2014.  Shelly is an Art Curator by profession and moonlights as an Oral Historian. An avid hiker, she enjoys spending as much time as possible in the out-of-doors with her toddler son.

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