Castell, 59, has had an extensive career in the healthcare industry, notably as chief executive for 16 years of Amersham International, followed by his appointment as vice chairman to the board of GE and responsibility for GE's global healthcare business. He stepped down from this post in April of this year when he became chairman of the Wellcome Trust.
Castell remains a director (non-executive) of GE and is a trustee of the Natural History Museum. At BP, he will join both the audit committee and the ethics and environment assurance committee.
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