Dylan Wiliam, PhD, is a consultant who works with educators all over the world to develop effective, research-based teaching. He is former deputy director (Provost) of the Institute of Education at the University of London. From teaching in urban public schools to directing a large-scale testing program to serving in university administration, his professional path has led to a variety of positions at the forefront of education.He has written over 300 books, chapters and articles including a major review of research on formative assessment coauthored with Paul Black. He left the University of London in 2010 to focus on working more directly with teachers, and now spends his time working with teachers all over the world on improving teaching and learning.