 His computer magazines pioneered the format of conducting sophisticated technical tests of computer products; as a result, their reviews would often make or break the introduction of new personal computers, modems, or CD-ROM drives.During the rapid-growth genesis of personal computing, Ziff Davis quickly became the dominant computer publishing firm in the world.Ziff had wanted to turn the business over to his sons- Daniel, Dirk and Robert -but they did not desire the responsibility.