Though he was not the first individual to launch a personal finance software company, Cook was the most successful. His focus on easy of use and customer service helped to develop Quicken into one of the most successful software applications introduced in the last two decades of the twentieth century. The success of Quicken was just the beginning. Cook and Intuit went on to launch a full suite of financial applications from on-line bill payment for individuals to inventory and account receivables management for small businesses. Through his acquisition of Turbo Tax in the early nineties, Intuit has gone on to dominate the software market for financial management applications.