Harvard professor says he gets thank-you notes from prisoners, some of which are secretly using smartphones to take his free computer-science class

• An inmate in Georgia told The Marshall Project he uses a contraband phone to teach other prisoners.

• He said he runs a group message teaching computer science using Harvard's CS50 online course.

• The Harvard professor told Insider he's received thank-you notes from prisoners who took the class.

Prisoners are using smartphones to access online classes, and at least one Harvard professor told Insider they even send him thank-you notes from time to time.

The Marshall Project reported on the rise of secret smartphone use amongst prisoners, and talked to one inmate who said that he leads a group message of around 300 other prisoners learning computer science using an online course from Harvard. The group message includes prisoners in other states, the inmate said, and they use Harvard's CS50: Introduction to Computer Science course materials that are available for free online.

"There are a bunch of schools that do that, but I find Harvard's are the best, and that professor — David Malan — I think he's one of the best," the inmate said, adding that the course is self-guided and self-graded.

Malan told Insider over email that he's received thank-you notes from students in prison over the years.

"We have such admiration for students who are trying to acquire new knowledge and skills on their own, ever more so in circumstances like those," Malan said.

In addition to inmates taking online classes like the man in Georgia, some pose as regular students in online classes, something that online learning through Zoom allows.

Because internet access is often restricted for students in prison, he said Harvard has tried to ensure that the materials for CS50 can be used offline by having downloadable videos and software that can be installed locally.

Malan encourages incarcerated students to reach out to him if they have trouble with accessing the course. He also wants to reassure them that, even for him after years of teaching computer science, programming something almost always takes longer than he expects, so he encourages them to not be too discouraged when struggling in the course.