The Visual Seating Plan card system was invented .
The Visual Seating Plan card system was implemented by Edward C. Delaney , a Harvard University graduate , and teacher at DeWitt Clinton High School in the Bronx , who died in 1969 .
The Visual Seating Plan card system was invented and implemented by Edward C. Delaney , a Harvard University graduate , and teacher at DeWitt Clinton High School in the Bronx , who died in 1969 .