Stephen LeMenager, associate dean and director of admissions, had been on paid leave. He has said he accessed the site to see how secure it was.
Princeton President Shirley Tilghman also said disciplinary action will be taken against some employees of Princeton's admission office. She declined to provide details.
"I think the action taken by our admission staff were breaches of ethical behavior and breaches of confidentiality," Tilghman said.
Yale officials said they found 18 unauthorized log-ins to their site that were traced to computers at Princeton. That included 14 from the admissions office, three from students elsewhere on campus and one from a Yale applicant who used a Princeton computer.
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