In 2005, a year after Ellie Grossman, a doctor, met Ray Fisman, a professor, on a blind date, she was talking to her grandmother about her guy.

“Never let a man think you’re smarter,” her grandmother advised. “Men don’t like that.”

Ray and Ellie “had a good laugh, thinking times had changed,” he recalled. The pair went on to marry — after she proposed.

But now, he says, “it seems like the students at Columbia University should pay heed to Grandma Lil’s advice.”

Mr. Fisman is a 36-year-old Columbia economics professor who conducted a two-year study, published last year, on dating. With two psychologists and another economist, he ran a speed-dating experiment at a local bar near the Columbia campus.

The results surprised him and made him a little sad because he found that even in the 21st century, many men are still straitjacketed in stereotypes.