Don't know how much you have already found, or if this helps.
The following notes extracted from a genealogy summary of Joe Roizen (written by his son), born 9th September 1923 in Kishinev, Romania. His family escaped the Russian revolution and fled to America when he was three months old. In 1956 he moved to Palo Alto in California to work for Ampex (a pioneer of magnetic tape recording). By 1960, he had built a new family house in Portola Valley, but moved with his family to spend almost a year in Bern, Germany in 1960/61. By the late 1960s he had parted ways with his first wife, founded his own company ‘Telegen’ in 1968 and then married his second wife, Donna Foster Roizen, in Geneva, Switzerland in 1971.
“… together, his and Donna's lives took on the form that would endure for the rest of his -- with the world travel and internationalization of his work, the prolific authorship of journal articles, conference talks, the building of his immense mental archive of jokes, and the pleasant flow of professional awards and honors. Best of all was the autonomy afforded by running his own company. Joe worked hard in the '70s, but this period found him at a professional plateau he had constructed for himself. He had, I think, in some sense arrived at a nearly ideal circumstance, and he knew it, and he relished it greatly. He was free to travel (and averaged 250K miles per year), free to pick and choose the clients he wished and take on the kinds of assignments he enjoyed most…”
“Together, Joe and Donna designed and helped construct their Portola Valley house, and moved in in 1976. They commenced a long and pleasant string of beautifully hosted dinner parties and houseguest visits of foreign friends. Building and finishing the new house continued over some time, something Joe always enjoyed doing. He also deepened his relationships with Donna's children, Bruce, Craig, and Sherri over these years…”
More recently, I saw one of her photographs (a portrait) credited on a website as “We thank Foster Beigler, formerly Donna Foster Roizen.”
I don’t know if it’s the same lady but there is, or was, an artist and printmaker named Foster Beigler active in art communities in the Portola Valley area of California in the early 2010s and known for large-scale linoleum block prints, woodcuts, and monotype prints of insects. She used to have a 'WordPress blog', but it no longer seems to exist. Donna Foster Roizen/Foster Beigler must now be very elderly and possibly deceased, but I couldn’t locate her on ‘findagrave’ under either name.
