What is Knowledge Worker?

Legal Definition
Knowledge workers are workers whose main capital is knowledge. Examples include software engineers, physicians, pharmacists, architects, engineers, scientists, public accountants, lawyers, and academics, whose job is to "think for a living".
-- Wikipedia
Legal Definition
Data analysts, product developers, planners, programmers, and researchers capturing data to analyze and manipulate into information as a product or service. US management guru Peter Drucker, born in Austria in 1909 popularized this.