Excel expert Dennis Taylor has 25+ years experience in spreadsheet authoring and training. Dennis Taylor has over 25 years of experience working with spreadsheet programs as an author, speaker, seminar leader, and facilitator. Since the mid-90s, he has been the author/presenter of numerous Excel video and online courses and has traveled throughout the US and Canada presenting over 300 seminars and classes. He has authored or co-authored multiple books on spreadsheet software and has presented over 500 Excel webinars to a diversity of audiences. Dennis has worked with hundreds of different corporations and governmental agencies as well as colleges and universities. He lives in Boulder, Colorado.