Roger D. Hansen, 55, the Andrew Mellon professor of international relations at Johns Hopkins University's Nitze School of Advanced International Studies, was found dead Feb. 8 at the home of a friend in Rehoboth, Del.

Rehoboth police said he died of carbon monoxide poisoning and that his death was a suicide. Colleagues at Johns Hopkins said Dr. Hansen suffered from a back disorder.

An authority in the field of international economic development and relations between the rich northern part of the world and the poorer southern part, Dr. Hansen had been on the faculty of SAIS, which is located here on Massachusetts Avenue NW, since 1976. His books included two studies that have been highly acclaimed in professional circles: "The Politics of Mexican Development," which was published by the Johns Hopkins Press in 1971, and "Beyond the North-South Stalemate," published by McGraw in 1979.

Dr. Hansen taught basic and advanced courses in the theory of international relations.

George R. Packard, the dean of SAIS, said he and his colleagues were "deeply saddened" by Dr. Hansen's death, adding, "He was an extremely talented person and a favorite teacher of a great many students."

Dr. Hansen, who lived in Washington, was born in Honolulu. He graduated from Yale University and went to Oxford University as a Rhodes Scholar. He received a master's degree in public administration from Princeton University and a doctorate in international relations from Johns Hopkins.

In the early 1960s, he was a writer and reporter for NBC in Washington. He then joined the National Planning Association, where he was an economist and project director. In the early 1970s, he was a deputy assistant in the Office of the Special Trade Representative.

In 1973, Dr. Hansen was named a senior fellow at the Overseas Development Council, and in 1977 he was on leave from SAIS as a senior staff member of the National Security Council. He spent the next three years as a senior research fellow at the Council on Foreign Relations in New York. In 1980 and 1981, he taught at the Lyndon B. Johnson School of Public Affairs at the University of Texas in Austin.

Dr. Hansen's other publications include "Central America: Regional Integration and Economic Development," a book published by the National Planning Association in 1967; contributions to "Rich and Poor Nations in the World Economy," published by McGraw in 1979; and articles in professional journals, including Foreign Affairs, World Politics and International Organization.

He was a member of the Cosmos Club and the Council on Foreign Relations.

Survivors include a brother, Jerry Hansen of Los Gatos, Calif.

JAMES A. COVOLO

Electrician

James Anthony Covolo, 22, a Clinton electrician for the past two years, died Feb. 7 in a car crash in Temple Hills.

A spokesman for the Maryland State Police said Mr. Covolo was driving north on Maryland Route 5 and went off the road to the right. Police said the vehicle struck a steel light support pole, trapping Mr. Covolo, and then caught fire.

Mr. Covolo, who lived in Temple Hills, was born in Washington. He attended special education classes at the Rica Cheltenham School in Upper Marlboro. For about the past two years, he had worked for the T.H.E. Electric Co. in Clinton.

Survivors include a daughter, Courtney Lynn Covolo of Waldorf; his parents, Donna and Robert Covolo, a brother, Robert L. Jr., a sister, Darlene Covolo, and a half-brother, John Meadows Jr., all of Temple Hills; and two grandparents, Edith and Eddie Dodson of Port Charlotte, Fla.