Here are some random examples of usage; the preposition before the name of the school is always "at"--the only exception I can think of occurs in the phrase "enrolled in [name of school]." He studied at the University of Wisconsin. He studied physics at the University of Wisconsin. He has a bachelor's degree in physics from the University of Wisconsin. He has a bachelor's in physics from Wisconsin. She studied music at Julliard. She studied at the Julliard School. She has a Julliard degree. She is going to Marist College. She is attending Marist College. She is studying at Marist College. She is taking courses in fashion marketing. She's studying fashion marketing at Marist. She was a business major at the University of Massachusetts. She majored in business at the University of Massachusetts. He is a music major at Montclair State University. He enrolled in the Rhode Island School of Design. <---Only example I can think of where you'd use "in." He studied at the Rhode Island School of Design. He studied at RISD. (Pronounced "riz-dee") He's a graduate of RISD. He's a RISD graduate.

(AT) at the University of Nebraska at the University of Michigan at the University of Pekin

In the name of (exemple) Brooklyn's university

Always "at" [university name]