THE NATURE OF THE APOSTLE LUKE.

Like the other New Testament Gospels, the Gospel of Luke and The Acts of the Apostles, are anonymous documents. Even when involved in first person narration, the writer of Acts identifies himself not as an individual with a name, but as one of a group. He may at times be present as a participant-observer, but his focus is not his individual identity.
The nature of the author becomes available from the language and style used in the narrative. He is well educated, probably urban, with firsthand exposure to rhetorical training and to the Hebrew Scriptures. Also the author is a person of some economic means, writing from the social location of those who traffic in technical or professional writings; and one of the "People of the Way,"a Christian, either second or third generation.
The author is a non-Jewish Semite, since only three Jews' names are mentioned in the New testament as coworkers with Paul, Arist-Archus, Mark, and Justus. The Scriptural intimacy and Jewish interests manifest in Luke-Acts do not require a hypothesis of Jewish authorship, but are equally compatible with significant exposure to Judaism by a non-Jew.
The name 'Luke' appears three times in the New Testament. Little reasons remains not to accept the traditional identification of Luke as the author of Like-Acts. The acceptance of his authorship make him responsible for the largest portion of the New Testament (28%).
Lucas as a companion of Paul, he is not simply one of Paul's traveling assistant, but a faithful person of comparable stature, a missionary colleague, and a fellow worker. Lucas was with Paul at Troas, the principal seaport of North West Asia Minor, 32 km/20mi South of the Hellespont (Dardanelles) and somewhat more than half the distance South of the traditional site of ancient Troy. In fact, Troas drew its name from Troad, the term applied to the part of Mysia that surrounded Troy. It was Paul's second missionary journey and Lucas accompanied him from there to Philippi, where he may have remained until Paul's return on his third missionary journey. Then Lucas accompanied Paul to Palestine at the end  of that missionary journey. After Paul was imprisoned for about 2 years at Caesarea, Lucas continued to be Paul's missionary companion in his journey to Rome for trial. There is no record to the outcome of Paul's appeal to Caesar. Then Luke joined Paul in sending greetings to Christians at Colossae when Paul wrote to them from Rome, he identified Lucas as 'the beloved physician.' He stayed close to Paul and was with him shortly before Paul's martyrdom.
As a beloved physician, his knowledge and skills as a healer had won him respect.