Rick Rappoport, who was the Fairfax City police chief for more than 13 years and a Fairfax County officer and commander for 24 years before that, has announced that he is stepping down next month to join the Amtrak police force as deputy chief for the mid-Atlantic and Southeast region.

Rappoport, 60, made the announcement in a letter to Fairfax City officials and to his own officers on Monday.

Rappoport’s top accomplishment in the city was winning voter approval for a much-needed new police headquarters — his department worked out of an old elementary school for years, with Rappoport in the principal’s office — and then getting it built. He also had to deal with a large wave of retirements. He established a Citizens Police Academy, and he teaches a class in police ethics at George Mason University.

Rappoport will work for Amtrak Police Chief Polly Hanson, the former head of Metro Transit Police and a former assistant to D.C. police Chief Cathy L. Lanier.

His last day will be May 9.

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