Click on the links below to access a selection of the articles featuring Professor Still.
How Crowds at the Capitol Have Been Counted
Crowd Scientists Say Women’s March in Washington Had 3 Times as Many People as Trump’s Inauguration
How Many Can Fit Into Times Square?
What If? Crowd Chaos at the Pope's Mass
Crowd Estimates Easy to Fight Over but Harder to Verify
How many protesters took to the streets on July 1?
The 10-Minute Mecca Stampede That Made History
Eagles parade attendance: Close to 700,000, experts say
Can technology help avoid stampedes?