Paul, Silvanus, and Timothy, to the assembly of the Thessalonians in God the Father and the Lord Jesus Christ: Grace to you and peace from God our Father and the Lord Jesus Christ.
Paul, Silvanus, and Timothy ...  The inclusion of Paul's distinguished helpers, Silvanus and Timothy, in this salutation was not intended as designation of them as co-authors with Paul of this letter, but rather as a mark of friendship and courtesy on the part of the apostle for these faithful workers who had so frequently labored and suffered with him on the mission field.  Silas was beaten and imprisoned with Paul at Philippi (Acts 15:19), and Timothy's imprisonment is mentioned in  Hebrews 13:23. Timothy's father was a Greek, and Silas was a Roman citizen.