The night before the start of his final semester teaching, after 35 years, Sam Freedman had a dream that he was going to miss class. He woke up with a strange jolt of relief. What comfort, he thought, to know that after three decades he still couldn’t shake his pre-semester agita.

The most difficult work, he has always believed, ought to evoke fear.

“All these years later I’m still anxious the night before, still concerned about getting here at 7:15 in the morning to be ready for all of you,” he said, facing his students on a Monday morning in January, wearing the same dark suit that he purchased in 1989 at Rothmans when he was first starting to teach and realized he needed formal professional attire.

The seminar that Freedman teaches at Columbia Journalism School began in 1991 as something of an experiment, testing whether students could, in the course of a semester, produce a book proposal to sell and hopefully publish. The results have proved his hunch: The class has led to 113 book contracts and 95 published books, out of some 675 people who have taken it.

This spring Freedman taught the course for the last time. He didn’t want to become one of those fading professors he remembers from college, the types who used laminated notes and made students wish they’d been around to take the class in its glory years. The journalism school does not have plans to continue the class in the same form after his departure.

“The course is an institution in itself and you could almost say that about Sam — his retirement is certainly the end of an era,” said Jelani Cobb, the dean of Columbia Journalism School, who regularly meets with Freedman at an Upper West Side diner to trade ideas about books and teaching.