The oldest inmate at the prison in Guantanamo Bay, Cuba, made his case Tuesday for freedom after more than a dozen years in custody.

Saifullah Paracha, a 68-year-old former businessman from Pakistan who also lived in the United States for more than a decade, appeared by video-teleconference link from the base before the Periodic Review Board, a panel of government officials in Washington that conducts parole-like hearings to determine if Guantanamo prisoners should be eligible for release.

Related: Guantanamo Bay: Obama Announces Plan to Close Controversial Detention Facility

Paracha, 68, would seem at first glance to be an unlikely candidate for freedom. The U.S. had at one time planned to try him by military commission and a profile released by the Pentagon before his review board hearing said he had provided financial and other assistance to al-Qaida, working with some of the group's most senior figures.

Undated photo of Guantanamo prisoner Saifullah Paracha. Paracha, the oldest prisoner at Guantanamo, is getting his first chance to plead for release after nearly 13 years in U.S. custody. International Committee of the Red Cross, Provided by lawyer David H. Remes / AP

But his lawyer, David Remes, said before the proceeding that Paracha was hopeful about his prospects because the board is supposed to focus on whether the prisoner would pose a threat to the U.S. in the future, and not any alleged past conduct.

"He's a 68-year-old man. He has a serious heart problem. He has severe diabetes," Remes said in a phone interview. "This is not the man who was seized 14 years ago. The board has to make a fresh assessment."

Let our news meet your inbox. The news and stories that matters, delivered weekday mornings. This site is protected by recaptcha

Related: Two Guantanamo Bay Detainees Headed to Ghana

A detainee profile released by the Pentagon before his review board hearing said he met Osama bin Laden in the early 2000s and later worked with Khalid Shaikh Mohammad to facilitate financial transactions and to develop al-Qaida propaganda.

It said Paracha and his eldest son, Uzair, tried to help an al-Qaida operative travel to the U.S. Uzair Paracha is serving a 30-year sentence in the United States for aiding terrorism.

Saifullah Paracha also conducted research on chemical, biological and nuclear weapons and offered suggestions to al-Qaida about how to smuggle explosives into the U.S., according to the profile released by the Pentagon.

A shackled detainee clutching paperwork is escorted by two gloved U.S. Military personnel to an Annual Review Board Hearing in Camp Delta detention facility on Guantanamo Bay U.S. Naval Base in Cuba in 2006. Brennan Linsley / AP file

He denies that he knew of any al-Qaida plots and says his involvement with the group was for profit, not out of loyalty, the profile said.

Paracha operated trading and real estate businesses in Pakistan as well as a broadcaster. He was captured in a U.S.-orchestrated sting in Bangkok in 2003 and sent the following year to Guantanamo, where his lawyer says he has been a "model prisoner," and taught English and business skills to other prisoners to help them upon release. "He has been a tremendously positive influence on his fellow detainees," Remes said.

Related: Senate Bill Passes to Ban Guantanamo Bay Detainees From U.S.

He wore the white prison uniform reserved for the prisoners considered the "most compliant" as he testified from a trailer on the base before the board, whose members gather in the Washington D.C. area. The hearing was closed to the media except for a short portion at the beginning in which the prisoner's representative reads a prepared statement.

Detainees in orange jumpsuits sit in a holding area at Camp X-Ray of Naval Base Guantanamo Bay in this January 11, 2002 file photograph Reuters File

The lawyer told the board that Paracha would prefer to be sent to an English-speaking nation but could also return to Pakistan, to re-join his family and resume his business, or to the United States, where he lived as a legal resident from 1970-86 working as a travel agent and has extended family, mostly in the New York area. Congress has forbidden transferring any prisoners to the U.S.

The board was not expected to make an immediate decision. So far, it has approved the release of 19 prisoners. The U.S. holds 91 men at the base in Cuba, including 36 cleared for release.