Last August, Warren Weinstein, an American development expert, was kidnapped by gunmen from his house in Lahore, in eastern Pakistan.
Late Sunday, a video of Weinstein pleading for his life was posted to an al Qaeda website.
"My life is in your hands, Mr. President," the 70-year-old air worker is seen saying. "If you accept the demands, I live. If you don't accept the demands, then I die."
Weinstein's message to Mr. Obama: Agree to the militant group's demands, and act quickly.
"If you respond to them," Weinstein says, "then I will live, and hopefully, rejoin my family and also enjoy my children, my two daughters, like you enjoy your two daughters."
This is the first time Weinstein has been seen since he was abducted by gunmen who tricked their way into his home in Lahore.
After the abduction, al Qaeda leader Ayman al-Zawahiri made a statement saying Weinstein would be released if the U.S. stopped all airstrikes in the Middle East and freed all Taliban and al Qaeda suspects being held.
Another al Qaeda leader wasSunday: Fahd al Quso. He topped the FBI's Most Wanted Terrorists list for his involvement in the bombing of the USS Cole in 2000.
To see John Miller's report, click on the video in the player above.