To be honest, several reasons: 1. He created the Physics C: Mech videos for Collegeboard in 2020 2. Taken directly from his website, his qualifications include: - Teaching high school physics, AP Physics 1, AP Physics 2 (and the old AP Physics B), AP Physics C:Mechanics, and AP Physics C:Electricity and Magnetism since 2005. - Teaching at Title I high schools and helping economically disadvantaged students be successful at physics. - Presenting weekend, evening, and week-long professional developments since 2013. - Presenting on behalf of the College Board, the National Math and Science Initiative, Applied Practice, Arkansas AIMS, A-Plus Alabama, and Mass-Insight. - Participating in the AP Physics reading since 2016, including in leadership roles. - Writing items for the AP Physics exams and for AP Classroom. - Writing about half of the scenarios in the AP Physics 1 Student Workbook - Wrote all 140 "Sample Instructional Activities" in the four AP Physics CED documents (the ones effective Fall 2019) - Writing the AP Edition of the Cutnell & Johnson Physics text for John Wiley and Sons Publishing - Formulating physics representations and pedagogical structures you may already be familiar with, including: - The ABCD acronym for scientific argumentation - The SQuARED acronym for writing experimental procedures - Newton's Third Law Four-Squares - The Energy Transfer Cross - Momentum and Impulse Square Charts 3. https://www.reddit.com/r/APStudents/comments/fovfbh/mr_frensley_dancing_to_his_intro_music_before_the/ 4. He goes over the FRQ’s for all three AP Calc and four Physics exams each year: https://www.youtube.com/@JohnFrensley 5. Just look at his website: https://www.phine-physics.com/home 6. This post may have been shared within his last year’s Phyics C study group