​About the Author Lawrence Leff is former Assistant Principal, Mathematics Supervision, at Franklin D. Roosevelt High School, a large urban high school in Brooklyn, New York. Mr. Leff served on many local mathematics committees including a term as a member of the New York State Regents Exam Preparation Committee. He has a strong interest in developing and publishing reader friendly mathematics review courses. Mr. Leff has used his many years of experience teaching and supervising all levels of high school mathematics classes, including SAT Math preparation classes, to create a highly effective SAT math study program. About the Publisher In the 1930s, Manuel H. Barron opened a bookstore in Brooklyn, New York.  People from the community asked Mr. Barron about books that might be available to help their children study for the New York State Regents exams. After realizing there wasn't anything available, Mr. Barron's created his own study guides. 80 years later, Barron's has helped millions of people prepare for their next step.