Roger is a director and practice leader for Ryan’s Sampling Analysis and Evaluation practice and is based in the firm’s Dallas Office. He is responsible for the design and evaluation of audit sampling methodologies with an emphasis on the use of multiple audit sampling methods in statistical and non-statistical sampling for transaction taxes. Roger has provided statistical consultation and expert testimony for a variety of companies, government entities and law firms. Prior to joining Ryan, Roger was professor of decision sciences for Texas Christian University and founding director for the Center for Teaching Excellence. Roger has made numerous presentations on audit sampling issues to professional and academic organizations. He has a Doctor of Philosophy Degree in Statistics from Texas A&M University.