I've had my fair share of poor professors, but Yegulalp is definitely one of the worst I've ever had here at Columbia. His lectures are not only dull, boring, and uninspiring, but he mumbles to himself, expects everyone to know exactly what he's talking about, and has a rather superior attitude as well. I am taking Environmental Data Analysis and his labs are literally him doing a trial and error run of R coding on the spot. He makes a million mistakes, just basically talks to himself as he codes, and never asks anyone how we are doing. Definitely one of the most uninspired, downright awful professors at Columbia.