Dr. Samuel E. Schwartz, father of Nanci Ryder, president of B/W/R Public Relations, died Oct. 6 of natural causes in Phoenix. He was 91.New York City native graduated from City College of New York in 1931 and New York U. School of Medicine in 1938. He served in the U.S. Army during World War II and practiced medicine for more than 40 years in Jackson Heights before retiring in 1983 to Scottsdale. In addition to daughter Nanci, he is survived by wife Lee, a son, another daughter, four grandchildren and five great-grandchildren.