Josephus was a Jewish historian who lived circa 37-100 AD. His Hebrew name was Joseph ben Mattathias, and he received an excellent education in Jerusalem. After leading a failed revolt of the Jewish forces against Rome, Josephus was captured and became a Roman citizen. He served as pensioner of several Flavian emperors and is most widely known by the name he then acquired, Flavius Josephus.
Around 93 AD., Josephus published Jewish Antiquities, a history of the Jews in twenty books. Though not a prominent subject of his writing, John the Baptist, Jesus of Nazareth, and Jesus' brother James are all mentioned in Jewish Antiquities. This represents the earliest historical record of Jesus from someone who was a professional historian.
James, the Brother of Jesus: Antiquities 20.9.1
"So he assembled the sanhedrim of judges, and brought before them the brother of Jesus, who was called Christ, whose name was James, and some others; and when he had formed an accusation against them as breakers of the law, he delivered them to be stoned..."
Jesus, Wise Man and Teacher: Antiquities 18.3.3
"Now there was about this time Jesus, a wise man, (if it be lawful to call him a man,) for he was a doer of wonderful works, a teacher of such men as receive the truth with pleasure. He drew over to him both many of the Jews, and many of the Gentiles. (He was the Christ;) and when Pilate, at the suggestion of the principal men amongst us, had condemned him to the cross, those that loved him at the first did not forsake him, (for he appeared to them alive again the third day,) as the divine prophets had foretold these and ten thousand other wonderful things concerning him; and the tribe of Christians, so named from him, are not extinct to this day."
Note: Interpolations, possibly added by others, are indicated in parenthesis.