SOCIaL Investment Scotland (SIS) has appointed  alastair Davis as its new chief executive.  Mr Davis joined SIS in May 2009 from Bank of  Scotland Community Banking and has a wealth of experience dealing directly with social enterprises. Before being appointed chief executive, Mr Davis was the lead fund manager for the Scottish Investment Fund, which SIS manages on behalf of the Scottish Government.  alf Young, the chairman of SIS,  said:   We had a very strong field of candidates for the chief executive s position  and we are delighted to appoint alastair. He has extensive experience of working alongside socia