Williams continues to strengthen its engineering squad as it undergoes a restructuring under the direction of Pat Symonds.
In addition to the impending arrival of Rob Smedley the team will be joined in the New Year by Jenson Button’s former race engineer Jakob Andreasen, who will work alongside Smedley, but in more of a factory-based role.
The Dane agreed to to join the team some months ago from Force India, where he has had the key role of chief race engineer. He has been credited with helping the Silverstone team to make progress.
Prior to joining Force India he was at McLaren. He originally worked on the Le Mans and GT programmes before leaving, but later returned to the F1 team. He was Lewis Hamilton’s data engineer before becoming Button’s race engineer from 2010.
As revealed here yesterday current Williams chief race engineer Xevi Pujolar is heading to Toro Rosso.
Adam Cooper's F1 Blog 
Williams keep adding more staff, but they lack stability and unity.