Short answers, pulled from the story.
Cunningham served as lunar module pilot on Apollo 7, the first crewed Apollo mission, launched on the 11th of October 1968. He was responsible for all spacecraft systems except launch and navigation. The eleven-day flight carried no actual lunar module.
Walter Cunningham was NASA's third civilian astronaut, after Neil Armstrong and Elliot See. He was selected as part of NASA's third astronaut group in October 1963.
Walter Cunningham accumulated 263 hours in space during Apollo 7, his only spaceflight. His total flying career spanned more than 4,500 hours, including more than 3,400 hours in jet aircraft.
Walter Cunningham published The All-American Boys in 1977, a memoir of his astronaut years. He also contributed to and wrote the foreword for In the Shadow of the Moon, a space history book published in 2007.
Cunningham left NASA in 1971 to become Vice President of Operations for Century Development Corp. in Houston. He later worked as a businessman, investor, radio talk-show host, public speaker, and consultant to start-up technology companies. In 2008, NASA awarded him the Distinguished Service Medal for his Apollo 7 mission.
Cunningham rejected the scientific consensus on climate change. He published Global Warming: Facts versus Faith in 2010 and wrote an editorial in the Houston Chronicle on the 15th of August 2010. In 2012, he co-signed a letter to NASA challenging "unproven assertions that man-made carbon dioxide was a major factor in global warming."