Question: Which member of the Epiphany Philosophers was also a Welsh Anglican bishop ?

Context paragraphs:
Ivor Rees (bishop): John Ivor Rees (19 February 1926 – 11 January 2012) was a Welsh Anglican bishop.  He was formerly the Bishop of St David's.

William Thomas (bishop): William Thomas (2 February 1613 – 25 June 1689) was a Welsh Anglican bishop.  He was the Bishop of St David's and later the Bishop of Worcester.

Huw Jones (bishop): David Huw Jones (1 July 1934 – 18 October 2016) was a Welsh Anglican bishop who served as the Bishop of St. David's from 1996 to 2001.

Llewellyn Gwynne: Llewellyn Henry Gwynne, CMG, CBE (11 June 18639 December 1957) was a Welsh Anglican Bishop.  He was the first Anglican Bishop of Egypt and Sudan (1920 - 1946).

Barry Morgan: Barry Cennydd Morgan (born 31 January 1947) is a Welsh Anglican bishop and academic.  From 2003 to Jan 2017, he had been the Archbishop of Wales and was therefore was both Primate and Metropolitan of the Church in Wales.  He was the Bishop of Bangor from 1992 to 1999, and was the Bishop of Llandaff from 1999 until his retirement in January 2017.  He was the longest serving archbishop in the entire Anglican Communion.  On 23 August 2016, the Church in Wales announced that Morgan would retire on 31 January 2017.

Rowan Williams: Rowan Douglas Williams, Baron Williams of Oystermouth, {'1': ", '2': ", '3': ", '4': "} (born 14 June 1950) is a Welsh Anglican bishop, theologian and poet.

John Morgan (bishop): John Morgan (6 June 1886 – 26 June 1957) was a Welsh Anglican bishop.  He served as Bishop of Swansea and Brecon (1934 to 1939), as Bishop of Llandaff (1939 to 1957), and then also as Archbishop of Wales (1949 to 1957).

David Thomas (bishop): David Thomas (22 July 1942 – 11 May 2017) was a Welsh Anglican bishop.  From 1996 to 2008, he served as the Provincial Assistant Bishop of the Church in Wales.  In this role, he ministered to those who could not accept the ordination of women as priests.

Epiphany Philosophers: The Epiphany Philosophers was a group of philosophers, scientists and religious (priests, nuns and monks) who met regularly and published between 1950 and 2010.  Their founders included Margaret Masterman, Richard Braithwaite, Dorothy Emmet, Robert H. Thouless, Michael Argyle and Ted Bastin.  Later members included Kwame Anthony Appiah, Rupert Sheldrake, Rowan Williams, Clive W. Kilmister, Frederick Parker-Rhodes, Jonathan Westphal and Yorick Wilks.

Gregory Cameron: Gregory Kenneth Cameron (born 6 June 1959) is a Welsh Anglican bishop.  He is Bishop of the Diocese of St Asaph in Wales, having been elected on 5 January 2009 and confirmed as bishop on 16 March 2009.

Supporting paragraphs: Epiphany Philosophers Rowan Williams
Answer: Rowan Williams