After 14 years as head of Architecture and Design at the Museum of Modern Art, Terence Riley, 51, will leave the institution in March. Though he worked on exhibitions of Frank Lloyd Wright, Mies van der Rohe, and Rem Koolhaas, critics have not had much praise for the department, complaining that its shows no longer introduce new talent and perspectives to the museum audience. In recent years Mr Riley has focused his attentions on installing the department’s large new galleries in the expanded mid-town home. He is also consulting on a new architecture and design museum planned for Murcia, Spain. A practicing architect himself, Mr Riley will devote more time to K/R, the New York-based firm he established in 1984 with his Columbia University classmate John Keenen which has been active in the Miami Design District.