Answer
Neal Stephenson's writing partner is George Jewsbury. Jewsbury has been working with Stephenson since 2010, and has helped him write several books, including "Seveneves" and "Reamde". Jewsbury is a software engineer, and he brings his technical expertise to Stephenson's writing. He helps Stephenson to make sure that the science and technology in his books is accurate, and he also helps to develop the plot and characters.