List of Famous people who are 81

Romesh T. Wadhwani is an Indian-American billionaire businessman, the founder, chairman and CEO of Symphony Technology Group (STG), a private equity firm for software, Internet and technology services companies.

John Cornwell FRSL is a British journalist, author, and academic. Since 1990 he has directed the Science and Human Dimension Project at Jesus College, Cambridge, where he is also, since 2009, Founder and Director of the Rustat Conferences. He is a Fellow of the Royal Society of Literature and was awarded an Honorary Doctorate of Letters in 2011. He was nominated for the PEN/Ackerley Prize for best UK memoir 2007 and shortlisted Specialist Journalist of the Year, British Press Awards 2006. He won the Scientific and Medical Network Book of the Year Award for Hitler's Scientists, 2005; and received the Independent Television Authority-Tablet Award for contributions to religious journalism (1994). In 1982 he won the Gold Dagger Award Non-Fiction (1982) for Earth to Earth. He is best known for his investigative journalism; memoir; and his work in public understanding of science. In addition to his books on the relationship between science, ethics and the humanities, he has written widely on the Catholic Church and the modern papacy.

Arturo Parisi is an Italian politician, leader of the Ulivist faction of the Democratic Party and four-time member of the Italian Chamber of Deputies. He was also minister of defence in the cabinet of Prime Minister Romano Prodi from 2006 to 2008.

John (Jean) Iliopoulos is a Greek physicist. He is the first person to present the Standard Model of particle physics in a single report. He is best known for his prediction of the charm quark with Sheldon Lee Glashow and Luciano Maiani. Iliopoulos is also known for demonstrating the cancellation of anomalies in the Standard model. He is further known for the Fayet-Iliopoulos D-term formula, which was introduced in 1974. He is currently an honorary member of Laboratory of theoretical physics of École Normale Supérieure, Paris.