Richard J. Feinberg, a pediatric allergist who had a private practice in Washington from 1966 until his retirement in 1989, died Sept. 26 at a hospital in Loveland, Colo. The cause was multiple organ failure, said his daughter, Jenifer Trachtman. In addition to his practice, Dr. Feinberg held staff appointments at what is now MedStar Georgetown University Hospital, Children's National Medical Center and Holy Cross Hospital in Silver Spring. In the early 1960s, while doing some clinical work, he was among the first Washington-area doctors to establish routine phenylketonuria (PKU) screening - which helped protect newborns against brain damage, seizures and intellectual disability. He was a consultant for the Asthmatic Children's Foundation and the American Academy of Allergy, Asthma and Immunology. Richard Justin Feinberg was a native of Fall River, Mass., and a 1946 biology and chemistry graduate of Wesleyan University in Middletown, Conn. He received a master's degree in bacteriology and immunology from Brown University in 1948 and was a 1957 graduate of University of Pennsylvania medical school. He was a Navy veteran of World War II and later conducted biological warfare research at Fort Detrick, Md., from 1948 to 1950. After retiring from his medical practice, Dr. Feinberg volunteered at the insect zoo of the Smithsonian Institution's National Museum of Natural History and in the Smithsonian Gardens greenhouse in Suitland. He moved to Colorado from Washington in April. His first marriage, to Jean Haskell, ended in divorce. Survivors include his wife of 43 years, Jan Seligman Feinberg of Loveland; three daughters from his first marriage, Laurie Feinberg of Baltimore, Elizabeth Feinberg of White River Junction, Vt., and Jenifer Trachtman of Philadelphia; three stepdaughters, Jody O'Konski of Fort Myers, Fla., Drue Bralove of Longmont, Colo., and Hilary Bralove of Loveland; a sister, Simmel Haim of Silver Spring; and six grandchildren.