Pentecostalism or Classical Pentecostalism is a renewal movement within Christianity that places special emphasis on a direct personal experience of God through the baptism in the Holy Spirit. The term Pentecostal is derived from Pentecost, the Greek name for the Jewish Feast of Weeks. For Christians, this event commemorates the descent of the Holy Spirit upon the followers of Jesus Christ, as described in the second chapter of the Book of Acts. Pentecostals tend to see their movement as reflecting the same kind of spiritual power and teachings that were found in the Apostolic Age of the early church. For this reason, some Pentecostals also use the term Apostolic or full gospel to describe their movement.

Pentecostalism is an umbrella term that includes a wide range of different theologies and cultures. For example, many Pentecostals are Trinitarian and others are Nontrinitarian. As a result, there is no single central organization or church that directs the movement. However some Pentecostal denominations are affiliated with the Pentecostal World Conference.

William Kay is a British financial and business journalist.

William Kay grew up in central London where he attended St Marylebone School and Westminster City School. In 1965 he was awarded an Open Styring Scholarship^{[citation needed]} to read Philosophy, Politics, and Economics (PPE) at The Queen's College, Oxford. In 1968 he received a BA (Hons) and subsequently a MA. In 2006 Kay accepted an invitation to emigrate to the United States as "an alien of extraordinary ability".^{[citation needed]} He lives in Pasadena, California, where he continues to write a weekly column for The Sunday Times of London. He lives in Pasadena with Lynne Bateson, also a journalist, and has two adult sons, Andrew and Ben, in London.

Kay was on the staffs of the London Evening Standard and the now-defunct London Evening News in the early years of his career, and has been freelancing, writing books and working for UK national newspapers since then.

The British edition of Who's Who records that William Kay has been the City Editor, Financial Editor, Money Editor or Personal Finance Editor of five British newspapers: The Times, The Sunday Times, The Independent, The Independent on Sunday and Mail on Sunday. Kay has also worked on the Daily Telegraph (1977–79) and the short-lived NOW! news magazine.^{[citation needed]} In 2009 Kay published his first novel, Pasadena Parade, a murder mystery set in Pasadena, California.