Unfortunately the bowl is unsigned, however, inside it was a hand written card that identified it as being made by Scott McDowell in Seattle, Washington, 1979.
The piece has been confirmed as made by Scott McDowell by his sister Kim who maintains a Facebook group showcasing Scott's works and life, which includes the following description of Scott.
Scott Andrew McDowell (1948-1992) was a talented ceramic artist and gay rights activist whose life was cut short by AIDS. He was born and raised in Tacoma, WA and graduated from the University of Washington with degrees in both Ceramics and Microbiology. Scott operated showrooms in storefront studios in New York City and Seattle's Pioneer Square. His clients included many fine craft galleries and stores such as Neiman-Marcus, Barneys New York, and Henri Bendel.
When I saw this piece, I immediately loved it, and wanted to buy it, however, it was rather expensive for me, so, I was about to put it back on the shelf, but then my good friend who was with me took it from me and said that she will buy it for me as a gift. It has since then been my favorite studio pottery / art pottery piece in my collection.