 Adler wrote six books a year for many years, mostly on scientific subjects for the junior-high and high-school levels.A book Adler wrote for adults in 1958, "The New Mathematics", was important in the "New Math" curriculum reform movement, and led to his frequent appearances at educational meetings throughout North America.In 1959, Irving and Ruth Adler together began writing "The Reason Why" series of books about scientific concepts for elementary school children.