Andrew Willatsen (8 October 1876 – 25 July 1974) was an architect chiefly remembered for bringing the influence of Frank Lloyd Wright and the Prairie School to the Pacific Northwest.

[4] The George Matzen House (1910) at 320 Kinnear Place, Seattle, is hipped-roofed, stuccoed, with a stunted cruciform plan typical of the Prairie style confined by a narrow, sloping site.

The proposal for the A.S. Kerry Mansion (1910) at The Highlands (constructed 1911 in an abbreviated form), reflected Wright's long, low, more expansive designs.

Although lacking the grand living and dining spaces of the original project, this house remains an impressive design; it is perhaps the best known of Willatzen and Byrne's work and is sometimes mistakenly attributed to Frank Lloyd Wright.

This imposing Dutch Colonial's strong lines and fine detailing show that the partners were comfortable with period revival design.

The firm also produced numerous business, commercial, and industrial structures, including their first project, the many oriel-windowed Nelson, Tagholm and Jensen Building (Hotel Louisa) at King Street & 7th Ave. S., Seattle, (1909).

The Black House was the prototype for several other Willatsen designs over the following decade, but its sweeping gable roof and continuous band of second floor windows set it apart from the others.

The curved entrance canopy became a sort of Willatsen trademark, gracing numerous homes of both Prairie and Period design, and one church.

After the decline in the popularity of the Prairie School, Willatsen worked in a wide variety of styles, designing stores, churches, and many other types of structures.

[7] His papers, drawings, and the furniture and art glass windows from the 1915 remodeling of his Boston Block office were acquired from Willatsen by the University of Washington shortly before his death.

[7] His surviving drawings, some notebooks, papers, and a transcription of his personal project ledger are in the Special Collections and Manuscript Sections of The University of Washington Libraries.

Early photos of the Clarke and Kerry Houses can be found in Homes and Gardens of the Pacific Coast (Frank Calvert; Editor, 1913) reprinted by the Queen Anne Historical Society, Seattle, (1988).