Jamieson, Fausset and Brown on 2 Timothy 4:14

14. Alexander the coppersmith--or "smith" in general. Perhaps the same as the Alexander (see on 1Ti 1:20) at Ephesus. Excommunicated then he subsequently was restored, and now vented his personal malice because of his excommunication in accusing Paul before the Roman judges, whether of incendiarism or of introducing a new religion. See my Introduction. He may have been the Alexander put forward by the Jews in the tumult at Ephesus (Ac 19:33, 34).

reward--The oldest manuscripts read, "shall reward," or "requite him." Personal revenge certainly did not influence the apostle (2Ti 4:16, end).