Question:
Which employer did Clive Ballard work for in May, 2006?

Context:
 Clive Ballard works for King's College London from Jan, 2003 to Jan, 2016. 
 Clive Ballard works for University of Birmingham from Jan, 1992 to Jan, 1995. 
 Clive Ballard works for University of Exeter from Jan, 2016 to Dec, 2022. 
 Clive Ballard works for Newcastle University from Jan, 1995 to Jan, 2003. 
 Clive Ballard works for Alzheimer's Society from Jan, 2003 to Jan, 2013.

Answer:
Alzheimer's Society