Studio TJP practices residential and commercial architecture that is ecologically, socially, and fiscally responsible across diverse project types, sizes, and budgets. We design enduring structures with thoughtful details and adapt fluidly to our clients’ evolving needs.
A deep grounding in architectural history informs our use of modern design, building methods, and materials. We take the long view—considering resource use over time—to deliver adaptable, lasting environments that follow principles of inclusive design and accessibility. From concept through completion, we guide clients with clear, practical direction.
OUR TEAM
Howard L. Miller, Principal
AIA, NCARB, LEED AP
Howard combines a keen eye for form, function, and color to create memorable, client-focused designs and custom furniture. A furniture designer, woodworker, painter, and ceramicist, he drew on maritime experience during a six-year restoration of the R-class sloop Pirate. Based in Seattle, Howard enjoys bonsai gardening, sailing, and skiing, and volunteers with his wife to support underserved local communities.
Cornell University, School of Architecture, Art, & Planning – Bachelor of Architecture (B.Arch), 1988 Licensed in Washington National Council of Architectural Registration Boards (NCARB) Certified Meets the Secretary of the Interior’s Professional Qualifications Standards in Historic Architecture Leadership in Energy and Environmental Design (LEED) Accredited American Institute of Architects, Seattle Chapter – Member, 2000 to present Puget Sound Bonsai Association – Board member, 2009 – 2017
Steven M. Campbell, Principal
AIA, LEED AP
Steve brings disciplined rigor to design, construction management, and firm operations. Focused on refined detailing, building technologies, and collaboration, he continually advances his interest in materials and sustainable design from concept through construction. A committed cyclist—he bikes to work year-round and has toured the Netherlands with his wife—Steve also promotes reduced urban congestion.
University of Cincinnati, College of Design, Architecture, Art & Planning – Bachelor of Architecture (B.Arch), 1990 University of Charleston, College of Arts & Sciences – 1982 – 83 Licensed in Washington (No. 9272) Meets the Secretary of the Interior’s Professional Qualifications Standards in Historic Architecture American Institute of Architects, Seattle Chapter – Member, 2007 to present United States Green Building Council, LEED AP BD+C – Member, 2008 to present
Ellen F. C. Mirro, Principal
AIA, NCARB, LEED AP | ARCHITECTURAL HISTORIAN
Ellen specializes in existing buildings and adaptive reuse projects. She brings a knack for solving complex design challenges by using the strengths of the existing conditions. As an Historic Architect and Architectural Historian, she secures Certificates of Approval from the Seattle Landmarks Board and provides consulting, landmark nominations and, stewardship for older buildings. Ellen collaborates thoughtfully with clients and communities and also manages a working farm with her husband.
University of Washington, Master of Architecture (MA), 2002 Study abroad programs in Rome, Cuba, and Mexico Washington State University, Architecture Program – 1998 University of California at Santa Cruz, Art History – Bachelor of Arts (BA), 1996 Licensed in Washington (No. 11430) National Council of Architectural Registration Boards (NCARB) Certified Meets the Secretary of the Interior’s Professional Qualifications Standards in Historic Architecture and Architectural History Leadership in Energy and Environmental Design (LEED) Accredited American Institute of Architects, Seattle Chapter – Member, 2012 to present Society of Architectural Historians, Marion Dean Ross Chapter
Rachel Gensi Humura, Associate Architect
Rachel blends meticulous detail with big-picture vision as Associate Architect, guiding projects from schematic design through permitting and construction. Licensed in Uganda, she draws inspiration from how people of different cultures, ages, and abilities experience the built environment. After working for a nationwide firm and as a freelance architect, she has joined our team. Rachel enjoys coffee, theater, and exploring parks and wild spaces in the Pacific Northwest.
Makerere University Uganda, Bachelor of Architecture, 2010 – 2015 Royal Institute of Chartered Surveyors Certificate, Construction Project Management, 2020 National Examination Board for Occupational Safety and Health, International General Certificate, 2019
Studio TJP’s Evolution
In 2018, the firm’s founders, Larry and Lani Johnson, transitioned ownership to their long‑time leadership team—Howard Miller, Steve Campbell, and Ellen Mirro. The practice was renamed Studio TJP to honor its past while embracing a new chapter.
Larry E. Johnson founded The Johnson Partnership in 1979 and led the firm for four decades, shaping its focus on architectural history, design, planning, and preservation. Lani Johnson joined in 1981 as a Founding Planner and expanded the firm’s planning expertise. Their legacy continues to guide the work we do for our clients.
