PAUL SIEFKEN ’92 was terrified of the big shoes he would have to fill. Not the size nine, dusty blue sneakers that Mister Rogers always put on as he sang “It’s a Beautiful Day in the Neighborhood.” Something even bigger than that—Fred Rogers’ legacy. It was 2012, and Siefken, director of children’s programming at PBS, had just received a job offer from Fred Rogers Productions to head its production for a time and go on to be its next president and CEO.