Kenneth Kyle, 47, was arrested at San Francisco International Airport on Monday after getting off a plane from Europe.
The FBI says it served a search warrant on his home and found 150 images of child porn had been sent to his computer.
Kyle is an assistant professor of public affairs and administration. He is listed as an editor of the Social Problems Forum newsletter.
The university is taking the allegations seriously and exploring possible disciplinary actions.
As the spring schedule now stands, Kyle is due to teach spring quarter.