January 19, 2020 marks the 100th anniversary of the birth of Donald Pearce Shiley (pictured at left with his wife, regent Darlene Shiley), namesake and benefactor of the Shiley School of Engineering. Donald Shiley was a 1951 University of Portland alumnus who studied mechanical engineering. He went on to great success as the inventor of the Bjork-Shiley tilting-disk artificial heart valve. In his honor, Aziz Inan, Shiley School of Egineering, has prepared the following mathematical curiosities to celebrate Shiley’s life and to express appreciation for his genius and generosity:

- If Donald Shiley’s 100
^{th}birthday expressed as 1/19/20 is split as 1, 19, and 20, 1 plus 19 equals 20. - Half of 100 equals the sum of the letter numbers of Donald.
- The prime factors of the reverse of Mr. Shiley’s birth year, namely 0291, add up to 3+97=100.
- The sum of the letter numbers of Donald Pearce Shiley equals 174. The number of days in any leap year (e.g., 2020) from Mr. Shiley’s birthday onwards equals twice 174.
- Additionally, Mr. Shiley’s 100
^{th}birthday expressed as 01/19/2020 is split as 01, 19, and 2020, the sum of 01 and 19 multiplied by the sum of the reverses of 01 and 19, namely 10 and 91, equals 2020. - Moreover, if Mr. Shiley’s 100
^{th}birthday expressed as 01/19/2020 is split as 0119 and 2020, one third of their sum yields 713 and the reverse of 713 is 317. Note that 317 interpreted in the day/month format as 31 July is the day Mr. Shiley died in 2010. - The sum of the prime factors of July 31 expressed as 731 equals 17+43=60 and 60 equals the sum of the letter numbers of Donald Shiley’s wife Darlene Shiley’s maiden name, Loran.
- Lastly, if 01/19/2020 is split as 01, 19, 20, and 20, the sum of these numbers yields 60 too.