January 10, 2020 – Mike Silagadze has big plans to upend the global textbook market. His 11-year-old Toronto software firm, Tophatmonocle Corp. (Top Hat), has been growing by 50 per cent a year, signing up professors to offer interactive electronic textbooks, tests and assignments on its platform, while traditional giants of the US$35-billion industry such as Pearson PLC have struggled.