Frank Parson was known as "The Father of the Vocational Guidance Movement," and in 1909 on his death bed wrote the manuscript "Choosing a Vocation." In this book, Parson developed a career counseling theory that emphasized matching a person’s talents with vocations. In order to do so, Parson would conduct extensive interviews with clients in order to extract large amounts of personal data from individuals. He would also assess clients for their interest and aptitude levels as well as their decision-making abilities.