A large, brass plaque hangs in the entryway of Pierson Middle-High School, recognizing the successful completion in 2003 of the largest expansion and renovation project in the district’s history. But the plaque, which lists the names of architects, construction managers, Superintendents Dr. John Barnes and Kathryn Holden, board of education members and faculty involved with the planning, design and construction, has one important name missing: former Pierson High School principal, the late Robert Schneider.