John Collins FRS (25 March 1625 – 10 November 1683) was an English mathematician. He is most known for his extensive correspondence with leading scientists and mathematicians such as Giovanni Alfonso Borelli, Gottfried Leibniz, Isaac Newton, and John Wallis. His correspondence provides details of many of the discoveries and developments made in his time, and shows his role in making some of these discoveries available to a wider audience. He was called "English Mersenne" for his extensive collecting and diffusing of scientific information.[1]