George Mamishisho Lamsa was an Assyrian author. He was born in Mar Bishu in what is now the extreme east of Turkey. A native Aramaic speaker, he translated the Aramaic Peshitta Old and New Testaments into English. He popularized the claim of the Assyrian Church of the East that the New Testament was written in Aramaic and then translated into Greek, contrary to academic consensus.

The Peshitta is the standard version of the Bible for churches in the Syriac tradition, including the Maronite Church, the Chaldean Catholic Church, the Syriac Catholic Church, the Syriac Orthodox Church, the Malankara Orthodox Syrian Church, the Malabar Independent Syrian Church, the Syro-Malankara Catholic Church, the Assyrian Church of the East and the Syro-Malabar Church.