LAKE FOREST, CA — Blaze Bernstein entered Borrego Park in the Foothill Ranch-Lake Forest area of Orange County Jan. 2 at 11 p.m. The college student, home for the holidays, was wearing a dark jacket, dark gray long-sleeved zip-up and white Adidas shoes.

His family said he hasn't been seen since, and now a massive search is underway to find the missing Ivy league student. "Bernstein is in Orange County on winter break from the University of Pennsylvania," an Orange County Sheriff's Department spokesperson said in a recent release. "Witnesses said he met up with a friend and the two drove to Borrego Park, where the teen exited the vehicle and entered the park."

Bernstein's father, Gideon Bernstein, set up a Facebook page to centralize information resulting from the search for his son. "Our son, Blaze, has been missing since Tuesday," he said on Facebook. "We will try to update this page in hopes that you can help us solve this mystery. If you have questions, you can post them here."

Annee Della Donna, an attorney and friend of the family, discussed the timeline since Blaze's mysterious disappearance. "At 9:30 p.m., he sent a text message with his family's Lake Forest address for a high school buddy to pick him up and take him to the park to meet the third person," she said. "The park is five minutes away and they got there about 10:30 p.m. Bernstein went off alone into the park while his friend waited back in the car."

Bernstein's friend eventually began sending text messages to him when he didn't return, but did not hear back from him, she said. The friend left and then returned at about 4 a.m. to look for Bernstein again.

"He didn't have anything with him," she said. "He didn't have his glasses or his medication. He didn't bring his wallet or a phone charger. I don't think he planned on this being a long trip and he just disappeared."

Witnesses say they saw someone matching Bernstein's height and weight walking along the southbound lanes of the 241 toll road in the disabled car lane about 5:40 a.m. Wednesday, Della Donna said. There was no evidence he was despondent in any way, the attorney said.