In 2005 the company changed its name to Willet Hauser Architectural Glass, Inc., to more accurately reflect the long-term direction of the studio.

[6] Under Henry's guidance, the company expanded from a regional business to a studio of national and international renown, with completed projects in all fifty states and fourteen foreign countries.

As the firm's projects became larger and more complex, a number of glass artists specializing in the replication of different design styles joined the studio.

[1] In 1973, John Phillips Sr. was living in Pennsylvania and started to work for Hauser Art Glass Co in Winona as a national salesman.

[10] The Willet Studio introduced the Dutch technique of Farbigem to the United States in 1966, after a visit to the Amsterdam glass factory known as Glas-Industrie Van Tetterode.

The pieces are held together by a crystal clear, flexible adhesive that was developed in the Netherlands which allowed the glass to naturally expand and contract.

The farbigem technique eventually fell out of favor due to the deficient technology of the adhesive which, with time, allowed the multiple layers of glass to separate.

The sheet lead overlay is formed in relief by repousse (literally "beaten up from the underside") to give a sculptured effect, and is also incised with slits of varying widths to let the richly colored glass background shine through in the daytime.

The fact that the sculptured lead surface has been "flown" with 23 carat gold leaf is the secret of the brilliant metallic night effect.

In 1910, William Willet was invited to compete for the design and installation of the Great Sanctuary Window in the West Point Cadet Chapel at the United States Military Academy.

[13] In 1965, the studio completed six leaded stained glass windows for Grace Episcopal Church in San Francisco, California.

Located in the east half of the north and south aisles,[14] the studio’s windows are part of a larger collection of art at the Cathedral which includes stained glass works by Charles Connick, Gabriel Loire and an altarpiece casting of the last work[15] completed by Keith Haring in the Cathedral’s AIDS Interfaith Memorial Chapel.

[14] In 2009, a copy of Gaudin’s New Testament Baptism (1964) design was displayed at the Rosenwald-Wolf Gallery as part of the University of the Arts Silver Star Alumni Award Exhibition.

In 1998 Willet Hauser was selected to fabricate faceted stained glass panels based on the winning designs of many of these artists.

In 2001, the studio received the monumental commission to design and create the entire stained glass fenestration for St. Martin’s Episcopal Church in Houston, Texas.

Ben Shahn, Frank Shoonover, Franklin Watkins, György Kepes, Jacob Landau, Ralph Pallen Coleman, Sadao Watanabe, Ellen Miret, David Pushkin, Max Abramovitz, Wallace Harrison have worked with the studio in other media.