sentences:  She was succeeded by the current Director, Charlie Stripp.An innovative NCETM development is the MatheMaPedia project, masterminded by John Mason, which is a "maths teaching wiki".Initially headquartered in London, it is headquartered in the south of Sheffield city centre opposite St Mary's Church, Bramall Lane on part of the A61 dual-carriageway (Sheffield Inner Ring Road), east of the Velocity Tower, near the Bramall Lane Roundabout; it is the headquarters of Tribal Education.