Nation of Second Chances. “During his presidency, President Obama granted clemency to 1,715 people —
mostly nonviolent drug offenders serving sentences in federal prison — more than any other president in history. Through beautiful photos and powerful words, Nation of Second Chances tells their stories.”

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The “more than any other president in history” doesn’t seem to be quite correct though. Obama has granted clemency “more than any other president in recent history” is more exact, since Harry S. Truman pardoned, commuted or rescinded the convictions of 2,044 people, and before him Franklin D. Roosevelt granted 3,687 pardons in his four terms in office, while Barack Obama pardoned 212 people and commuted the sentences of a further 1,715 people, 1,927 people in all. (Source: Wikipedia, but the numbers seem to agree with those of the United States Department of Justice.)