Dr. Andrew Marion Welin died of natural causes at age 75 in his home in Dunsmuir, California in mid-November 2015. He had recently returned from an extended stay in Poland.

Andrew was born on December 10, 1939 in Warsaw, Poland to Kazimierz and Janina (Ryniewicz) Welin.

Andrew graduated from Warsaw Polytechnic Institute (1962) and University of Texas (PhD, 1973). He worked at Honeywell, RCA, North Electric, Raytheon, and as a consultant. He taught at the Universities of De Los Andes in Bogota, Columbia, Kentucky, and Bowling Green, Ohio.

Andrew married Eva Kolatorowicz on December 20, 1962. Together they emigrated from Poland via England and Columbia to the USA. They lived in Florida, Massachusetts, Texas, Kentucky, Ohio, and Rhode Island. Andrew later moved to New York and California.

Raised in Toruń, Andrew was riveted by all forms of mathematics and was the winner of the Polish Math Olympics. He could make the abstract concepts seem elegant and simple and was very proud to be involved in the inception of computer science.

Andrew’s lifetime avocation was writing. He enjoyed books, chess, cooking, dancing and irises. He enjoyed wry humor and quirky puns yet could never finish a joke: he would laugh too hard in the telling.

In later life he would often end conversations with a phrase that seemed too grand for casual banter, but always seemed worth aspiring to: “Have a good life.”

Surviving Andrew are his sister, Krystyna Pomorska of Revere, Massachusetts; his former wife, Eva (Kolatorowicz) Holland of West Newbury, Vermont; and offspring: Kasia Welin Grossman and Daniel Grossman of Nashua, New Hampshire; Krysia Zofia Blossom Hunter of Alameda, California; Ania Welin and Joshua Heinberg of Wilmington, North Caroline; and Janusz Andrzej Welin. Andrew’s eight grandchildren are David, Gavriella, Elzashira, Ezra, Kieran, Akira, Itzel, and Zaida.

Additional information will be announced online through the New York Times.