Schoolmaster said there was never a dull moment when Streich was nearby.

“If I weren’t his proctor and I were in college, I would want to hang out with him too,” Schoolmaster said.

Though known primarily around campus for his scientific work and his stewardship of “The Property,” Streich had yet more claims to fame.

His Porsche, studded with parking tickets, could frequently be seen parked on De Wolfe Street by Leverett House, where he lived before leaving the College.

Through the record company which he founded along with friends, Streich released a single called “Drink Yo’ Milkshake” with Houston-based rapper Ally Smooch.

“Whenever he went in on one of his projects, it was completely open,” Pforzheimer said. “He brought all of us onto 91 Records.”

As he adopted new endeavors, he was always inclusive of others, friends said.

Pforzheimer recalled a time that Streich took him and other friends to an office where he once worked on Brattle Street. In the office, Pforzheimer said Streich opened up a safe that contained his original tubes of graphene from his research and a solar panel. Streich broke the solar panel into little pieces and gave one to everyone in the room.

“He wasn’t about to hold anything over your head and wanted everyone to be involved,” Pforzheimer said.

Streich’s welcoming nature left a lasting impression on others who knew him.

Even after he left Harvard, Streich spent the next summer frequently inviting as many Harvard students as he could to a hotel he stayed at in New York City. He once drove 15 hours in his Porsche, from Chicago to the Hamptons, N.Y., to visit friends.

“Since he was so accomplished, people kind of dwell on that, which is important and impressive, but he was a great guy, and that’s the part that hurts the most,” Schoolmaster said.

From planning parties to researching nanotechnology and more—in between, Streich found time to serve as his county Democratic Party treasurer in Wisconsin and to found a second company, focused on developing solar energy technology—Streich’s efforts were geared toward making a difference.

“As for social impact, who doesn’t want to have a social impact?” Bozman said. “He did. He won.”

—Staff writer Nicholas P. Fandos contributed to the reporting of this story.

—Staff writer Melanie A. Guzman can be reached at melanieguzman@college.harvard.edu.