What has the author James Usher written?

You're likely thinking of James Ussher, an Irish Archbishop who is famous for his Annales Veteris Testamenti, published in 1650. In this work, he calculated the date of creation as 4004 BC.

While his work is no longer considered scientifically accurate, it was highly influential in its time and is still a point of reference for those interested in the history of biblical chronology.

Let me know if you'd like to know more about Ussher's life and work.