There is a nice article I just read from a small paper in San Diego near where Phyllis Robinson lives. She and her husband were hugely important in getting the California harp scene happening in the 70's and she still runs the string part of the business - maybe you've ordered Robinson strings yourself.
Robbie was a force of nature and I will always be indebted to him for the interest he had in Paraguayan music and especially for the folk harp journal which he began. He and Phyllis were so kind to me when I went to Paraguay to participate in a big harp festival and stayed on to study there. And they definitely were an inspiration to Joseph as well, as he attended the first Folk Harp conference in San Diego which they organized, in 1984.
Sadly Robbie died about 15 years ago, but Phyllis has continued the business. You can see the article on-line here