Then after three years, I went up to Jerusalem to get acquainted with Cephas and stayed with him fifteen days. I saw none of the other apostles—only James, the Lord's brother. I assure you before God that what I am writing you is no lie. (Galatians 1:18-20)
What writings of the New Testament are actually from Paul? I know of no serious scholars that deny that Paul wrote Galatians. In fact you will read in any search or book that is of any reputable scholar that Galatians is authentic. Paul claims in these verses to have met James, the brother of the Lord.