In the United States, audiences know him for his involvement with that vocal group and for his renditions of "God Bless America."

He represented Ireland in the 1984 and 1988 Summer Paralympics, winning four golds, two silvers, and one bronze medal.

[4][5] In the following years, Tynan became the first person with a disability to be admitted to the National College of Physical Education, in Limerick.

He worked for about two years in the prosthetics industry, then went to Trinity College, became a physician specialising in Orthopedic Sports Injuries, and graduated in 1993.

A devout Roman Catholic, Tynan has appeared on Eternal Word Television Network (EWTN).

Bush's friend and former aide James Baker said that while Tynan was singing "Silent Night", "[b]elieve it or not, the president was mouthing the words.

Shortly after this, the Yankees cancelled Tynan's performance of "God Bless America" for Game 1 of the 2009 American League Championship Series on 16 October 2009 because of the incident.

[11] Only 4 July 2010 Tynan performed "God Bless America" for the Boston Red Sox at Fenway Park with the support of some in the local Jewish community.