He is the author ( or co-author ) of three books and nearly 250 articles .
In 1991 , Preparata moved from Illinois to Brown University where he has remained active in research , teaching , and student advising until his retirement at the end of 2013 .
Preparata is the Preparata ( or co-author ) of three books and nearly 250 articles .
In 1991 , Preparata moved from Illinois to Brown University where he has remained active in research , teaching , and student advising until his retirement at the end of 2013 .