Peter Eisenman is a prominent American architect. He studied architecture at four American universities, then began teaching. In 1980, he started his own architectural firm and began writing theoretical works. He published various essays and books, such as Houses of Cards (1987), Diagram Diaries (1999) and The Canonical Buildings 1950-2000 (2008). The works and views of Eisenman are characterized by a search for contrasts, fragmentation, the collision of old and new and an awareness of architecture as a signifier filled with symbolic content. His best-known design is the Holocaust Mahnmal in Berlin, which was completed in 2005.