William Zhou is cofounder and CEO of Chalk.com. Before the age of 23, Zhou had started and sold a business, and created an education software company—Chalk.com. Chalk.com is a “Microsoft Office for teachers.” Once when Zhou went to visit some of his old high school teachers, he learned of the struggles that the teachers deal with each day– having to organize lesson plans, deal with attendance, and grade papers, tests, and homework, not to mention deal with their superiors and parents of the students. Therefore, Zhou promised to help them out with this issue. Chalk.com is a source that allows teachers to store all of their work. They can organize lesson plans, tests, quizzes, homework, attendance, etc. Today, Chalk.com is used in over 20,000 schools. It helps both teachers and students handle the stress of school.