When C-SPAN conducted our first Historians Survey of Presidential Leadership in 2000, we worked with a team of nationally recognized historians to establish the survey's framework: Douglas Brinkley, Edna Greene Medford and Richard Norton Smith. They recommended the 10 qualities of presidential leadership and guided us on the survey's organization, execution and analysis of the results. While other advisers have joined for certain years, this core group has remained with us for each subsequent survey. In 2021, our fourth survey, we welcome the addition of Amity Shlaes. Our advisers' research and writing in American history span from the nation's founding to the late 20th century. For each survey cycle, our group of advisers assesses the leadership qualities, recommends additional participants and reviews the results tabulated by C-SPAN.