Goodell names Dr. Allen Sills as NFL's Chief Medical Officer
Head case: Batting helmet's development began in Pittsburgh
NFL CMO Dr. Sills on Guardian Caps Mandate >> Guardian Sports
Dr. Allen Sills: Sick NFL Players Must Isolate Even with Negative COVID-19 Tests, News, Scores, Highlights, Stats, and Rumors
NFL's Lead Doctor Turns Down Reported Helmet Change - The Spun: What's Trending In The Sports World Today
Kyle Turley sets the record straight - by Melissa Jacobs
Seeking to reduce head contact, NFL mandates use of Guardian Cap helmet for early portion of training camp - ESPN
Shawne and Allen Sills, NFL chief medical officer, named Heritage Ball chairs, Features
It's not OK': NFL concussions rose 16% in 2017 amid CTE fears, Concussion in sport