In 1485, following his death in battle against Henry Tudor at Bosworth Field, Richard III's body was buried in Greyfriars Church in Leicester. Following the discoveries of Richard's remains in 2012, it was decided that they should be reburied at Leicester Cathedral, despite feelings in some quarters that he should have been reburied in York Minster. His remains were carried in procession to the cathedral on 22 March 2015, and reburied on 26 March 2015 at a religious re-burial service at which both the Right Reverend Tim Stevens, the Bishop of Leicester, and the Most Reverend Justin Welby, the Archbishop of Canterbury, officiated. The British Royal Family was represented by the Duke and Duchess of Gloucester and the Countess of Wessex. The actor Benedict Cumberbatch, who is a distant relation of the king and later portrayed him in The Hollow Crown television series, read a poem by Poet Laureate Carol Ann Duffy. His cathedral tomb was designed by the architects van Heyningen and Haward. The tombstone is deeply incised with a cross, and consists of a rectangular block of white Swaledale fossil stone, quarried in North Yorkshire. It sits on a low plinth made of dark Kilkenny marble, incised with Richard's name, dates and motto (Loyaulte me lie - loyalty binds me). The plinth also carries his coat of arms in pietra dura. The remains of Richard III are in a lead-lined coffin, inside an outer English oak coffin crafted by Michael Ibsen, a direct descendant of Richard's sister Anne of York, and laid in a brick-lined vault below the floor, and below the plinth and tombstone. The original 2010 raised tomb design had been proposed by Langley's "Looking For Richard Project" and fully funded by members of the Richard III Society. The proposal was publicly launched by the Society on 13 February 2013 but rejected by Leicester Cathedral in favour of a memorial slab. However, following a public outcry, the Cathedral changed its position and on 18 July 2013 announced its agreement to give King Richard III a raised tomb monument.

Answer this question "What clergyperson officiated?" by extracting the answer from the text above.
Right Reverend Tim Stevens,