The UC Berkeley Police have arrested and identified the suspect (pictured below) who was caught on camera attacking a young college conservative. According to CBS:

BERKELEY (CBS SF) — A man being sought for the assault of a conservative activist on the University of California, Berkeley campus last month has been arrested.
A statement from UC Berkeley Public Affairs said a warrant was issued for suspect Zachary Greenberg and UC police arrested him Friday, booking him into jail at 1 p.m.
[…] Police will formally present the case to the Alameda County District Attorney’s Office for consideration of the filing of criminal charges, the university said. (read more)
Another conservative student was assaulted on @UCBerkeley's campus. I just spoke to the survivor of the attack who is a dear friend of mine. He is in good spirits and plans on continuing to fight for conservative values on campus once his black eye is gone! What a bad a**! pic.twitter.com/g67Y9pAszD
— Bradley Devlin (@bradleydevlin) February 21, 2019
Here is the altercation from my friends perspective. Conservative activists, take note. This is exactly the right thing to do, and I am so proud of him for recognizing the situation and not retaliating with violence. pic.twitter.com/QEuJWEQtz8
— Bradley Devlin (@bradleydevlin) February 21, 2019