Vesting is the technique used to allow employees to earn their equity over time. You could grant stock or options on a regular basis and accomplish something similar, but that has all sorts of complications and is not ideal. So instead companies grant stock or options upfront when the employee is hired and vest the stock over a set period of time. Companies also grant stock and options to employees after they have been employed for a number of years. These are called retention grants and they also use vesting.
Fred Wilson has been a venture capitalist since 1987. He currently is a managing partner at Union Square Ventures and also founded Flatiron Partners. Fred has a Bachelors degree in Mechanical Engineering from MIT and an MBA from The Wharton School of Business at the University of Pennsylvania. Fred is married with three kids and lives in New York City.