Annas was the former high priest, the most powerful individual of all the Jews, and father-in-law of Caiaphas, the high priest during the preaching of Jesus.  Annas was a high priest and was deposed from office in A.D. 13.  He was distantly related to Salome.  Annas spent a lot of cordial time with Jesus in A.D. 22. showing him the temple.  When Jesus began preaching in Jerusalem he visited Annas, but was received very coldly. 
The "sons of Annas", that is, priests of the family of the high priest, had bazaars in the temple with them doing a succulent business; but this business was overthrown some time later.  Enmity with Jesus arose when he threatened his revenues by driving the money changers out of the temple. 
Annas pretended to find out how to make Jesus leave the country.  He was reluctant to participate in the murder of Jesus.  The Romans were used to dealing with Annas.  The Roman captain who captured Jesus had orders to take him to Annas first, not Caiaphas before.  Annas palace was on the Mount of Olives near Gethsemane and Jesus was taken there.  He was disturbed by Jesus’ refusal to answer him.  That is when Annas’ chief steward struck Jesus in the face.  As he saw that he did not get anything from Jesus he sent him bound to Caiaphas. 
See also: UB 190:3.3.