Jerome Coonen

Jerome Toby Coonen (born October 1953) is a mathematican who was an early employee of Apple Computer.

Education
Coonen received a B.S. and M.S in mathematics from the, graduating Summa Cum Laude in 1975. He received his Ph.D. in mathematics from the University of California, Berkeley in 1982. During his studies at Berkeley, Coonen worked with his professor to develop a  standard for microprocessors, which became known as.

Apple Computer
Upon graduating in June 1982, Coonen joined Apple Computer where he became a software engineering manager. His work on floating point arithmetic was applied towards what became the Macintosh 128K and was the foundation of the Standard Apple Numerics Environment (SANE) for the Motorola 68000. He also conducted code reviews of the ROM and Macintosh system software.

After the launch of the Macintosh, Coonen led development of the expanded ROM of the Macintosh Plus and worked with Adobe to improve the speed of PostScript and LaserWriter software. He then proceeded to manage software development of the Macintosh II. He later served as the first software engineering manager of the Newton platform.

After Apple
After leaving Apple in April 1992, Coonen consulted for various companies, including Hewlett-Packard, Metrowerks, Microsoft, Taligent, and Apple, largely on projects related to floating-point arithmetic. In January 2000, Coonen founded Xetus Mortgage Corporation to develop a paperless system to automate the origination of home mortgages. In September 2011, he joined, where he served in engineering and product management roles. Since October 2017, Coonen has served as a director of the Arithmazium museum of computer arithmetic.