The list is ordered alphabetically in categories. The * indicates they also have a blog that's worth reading.
Academics and Writers
Annie Murphy Paul: Author of the forthcoming book Brilliant: The Science of How We Get Smarter
Becky Allen*: Reader in Economics of Education at Institute of Education. Quant wizard.
Becky Francis: Professor of Education and Social Justice at King's College.
Chris Husbands*: Director of the Institute of Education
Dan Willingham: Cognitive Psychologist and Author of Why Don't Students Like School?
Daisy Christodolou*: Research and Development manager at ARK, Author, super-smart.
David Weston*: Former teacher, Chief Executive of the Teacher Development Trust
Dylan William: Professor, expert in assessment and curriculum
Gifted Phoenix: (Not his real name) Education policy analyst specialising gifted and talented
Graham Birrell: Senior Lecturer in Education at Christchurch Canterbury
Laura McInerney*: Former teacher, blogger, columnist, complete genius if a bit too Fabian.
Loic Menzies*: Researcher, Author, Blogger, Teacher Trainer.
Martin Robinson: Author and teacher trainer
Rob Coe: Professor of Education at Durham
Duncan Spalding: Norfolk Headteacher
John Tomsett*: Headteacher in York
Geoff Barton: Head in Suffolk. Frequent tweeter, occasional blogger, not a big fan of Ofqual.
Liam Collins: Head in East Sussex
Rachel de Souza: CEO of the Inspiration Trust; a forward thinking academy chain in East Anglia
Ros McMullen: Principal of David Young Community Academy in Leeds.
Tom Sherrington*: One of the best blogging heads
Ann Mroz: Editor of the Times Education Supplement
Greg Hurst: Education Editor at The Times
Helen Warrell: Covers education for the Financial Times
Jonn Elledge: Editor of Education Investor Magazine. More left wing than that makes him sound.
Michael Shaw: Director of TESPro
Nick Linford: Editor of FE Week
Reeta Chakrabati: BBC Education Correspondent
Richard Adams: Education Editor at the Guardian
Sanchia Berg: BBC education specialist; currently on Newsnight
Sean Coughlan: BBC online education correspondent
Sian Griffiths: Education Editor at the Sunday Times
Toby Young: Free School Founder, columnist, provocateur.
Warwick Mansell*: Guardian Education Diarist, freelancer, blogger.
William Stewart: Reporter at the Times Education Supplement
Policy and Politics
Andrew Adonis: Former education Minister and Author
Brett Wigdortz: CEO of Teach First and my boss.
Conor Ryan: Former adviser to David Blunkett and Tony Blair. Now at Sutton Trust.
Dominic Cummings: Former Special Adviser to Michael Gove
Fiona Millar: Columnist and campaigner for comprehensives; former adviser to Cherie Blair.
Gabriel Sahlgren: Research Director at the Centre for Market Reform of Education.
Gerard Kelly: Former Editor of the Times Education Supplement.
Graham Stuart: Chair of the Education Select Committee
Jonathan Clifton: Senior Research Fellow at IPPR, working on education and youth policy.
Jonathan Simons: Head of Education at Policy Exchange. Ex-cabinet office.
Michael Barber: Chief Education Advisor at Pearson. Former Head of the PM’s Delivery Unit.
Pasi Sahlberg: Finnish education expert - author of Finnish Lessons
Robert Hill*: Former adviser to Charles Clarke and Tony Blair. Currently advising Welsh Govt.
Stephen Tall*: Development Director at the Education Endowment Foundation
Tim Leunig: DfE Director of Research
Tom Richmond: Policy Adviser to Nick Boles
Tristram Hunt: Shadow Secretary of State for Education
Alex Quigley*: Subject Leader of English & Assistant Head. One of my favourite bloggers.
Alex Weatherall: Science / Computer Science teacher
Andrew Old*: Anonymous teacher; caustic, brilliant, blogger and Man of Mystery
David Didau*: Teacher, Author and one of the most popular teacher bloggers.
Debra Kidd*: AST for Pedagogy, formerly Senior Lecturer in Education, MMU.
Harry Fletcher-Wood*: History teacher and CPD leader at Greenwich Free School.
Harry Webb*: Ex-pat Brit teaching in Australia. Great, analytic, blogger.
Katie Ashford*: Secondary English teacher
Keven Bartle*: Senior Leader and entertaining blogger
Kristopher Boulton*: Maths teacher at ARK King Solomon Academy
James Theobold: English teacher. Funny.
Jo (readingthebooks)*: Head of English in a London school.
Joe Kirby*: English teacher + prolific blogger
John Blake*: History teacher and Editor of Labour Teachers
Lee Donaghy*: Senior Leader at Parkview school, Birmingham.
Michael Merrick*: Teacher of many subjects and professional contrarian.
Michael Tidd*: Sussex middle school teacher (KS2) and blogger
Micon Metcalfe: Business Manager at Dunraven School. Edu-finance queen.
Red or Green Pen?*: Anonymous Maths teacher and great blogger
Stuart Lock*: Deputy Headteacher
Tessa Matthews*: Pseudonym for a English teacher + super blogger.
Thomas Starkey*: FE English teacher
Tom Bennett*: Teacher, Blogger, Author, ResearchED Founder, Scot.
And of course...
SchoolDuggery: Queen of Education on twitter; unclassifiable. Must follow.