Mark Barnes is a veteran classroom teacher, education consultant, and author of the critically acclaimed Role Reversal: Achieving Uncommonly Excellent Results in the Student-Centered Classroom (ASCD, 2013), The 5-Minute Teacher (ASCD, 2013) and Teaching the iStudent (Corwin, 2014). A longtime adjunct professor at two Ohio colleges, Mark has created five online courses on web-based instruction, mobile learning, and using Twitter in the classroom and as a professional development tool. A leading expert on student-centered learning, Mark has helped thousands of educators build digitally enhanced, project-based, no-grades classrooms. Mark is the creator of the internationally recognized how-to video site for educators, Learn it in 5, and publisher of the popular education blog Brilliant or Insane. Named a Top 10 education technology blog by EdTech Magazine in 2014, B or I inspires hundreds of thousands of loyal readers. Mark’s Facebook group, Teachers Throwing Out Grades, is a growing collection of educators dedicated to changing the way learning is assessed, and this group helped launch the #ThrowOutGrades Challenge. Mark can be found sharing information and articles about best practices in education daily on Twitter at @markbarnes19. http://www.markbarnes19.com/ http://www.brilliant-insane.com/ https://www.facebook.com/groups/teachersthrowingoutgrades/ View the author′s TED talk here: https://www.youtube.com/watch?v=JShsO5PvYG4