Vivian O’Gara Weyerhaeuser was born Oct. 20, 1930, in Chicago and grew up in St. Paul, Minn. She was the fourth generation of a family that founded the Washington state-based Weyerhaeuser timber company, and her parents taught her the value of community service, hard work, and altruism. She graduated from Miss Porter’s School in Connecticut in 1948 and earned a bachelor’s degree in English literature from Vassar College in New York in 1952. She made the Philadelphia region her home as an adult. She met aviation pioneer Frank Piasecki at a party in Washington, and they married in 1958. They settled in Haverford and had daughters Lynn and Nicole, and sons Frederick, Frank, Michael, John, and Gregory. Her husband died in 2008. In addition to her children, Mrs. Piasecki is survived by 21 grandchildren and other relatives. A sister died earlier.