MIAMI — Two weeks after the release of an imprisoned spy whom President Obama called “one of the most important intelligence agents the United States has ever had in Cuba,” the man’s family is still asking: Where is he?

Rolando Sarraff Trujillo, 51, is a former Cuban intelligence officer who was serving a 25-year prison sentence for espionage. Few people in or out of Cuba had heard of him until Dec. 17, when Mr. Obama announced that a man “whose sacrifice has been known to only a few” was safe on American shores after 19 years behind bars in Cuba. In exchange for Mr. Sarraff, the United States freed three Cuban agents jailed here since 1998, as the two countries moved toward normalizing diplomatic relations. The Cuban government also freed an American subcontractor held for five years for bringing communications equipment into the country.

But Mr. Sarraff has yet to surface in public or to contact his parents, whom he had been calling daily from prison.

Mr. Sarraff’s sister, Vilma, said her family grew alarmed on Dec. 16 when her brother failed to make his daily phone call from prison to his parents. They then learned he had been released from Cuba’s Villa Marista prison, but since then, no American or Cuban official has notified the family of his whereabouts, she said.