Obituaries

He graduated from George Washington University and received a degree from its medical school in 1942. He did a four-year internship at the Mayo Clinic and returned to the area to practice medicine.

Dr. Castro was a founding member of the American Board of Colon and Rectal Surgery, president of the National Society of Colon and Rectal Surgeons in 1975 and was twice named by his peers as one of the "best medical specialists in the U.S." The Montgomery County Medical Society named him its clinician of the year in 1984.

He was a founding member of the Pan American Medical Society and was once its president. He was also an associate professor of surgery at Georgetown University Medical Center.

Dr. Castro retired to Marathon, Fla., in the Florida Keys in 1985, where he enjoyed fishing, kayaking, snorkeling, swimming and walking the Seven Mile Bridge.

He also enjoyed fashioning butterflies out of semi-precious stones, which he gave as gifts, and he painted in oils and watercolors. He and his second wife traveled extensively, volunteering for research expeditions for conservation groups such as Earthwatch and as animal researchers in Borneo and Africa. They visited Antarctica several times.

His marriage to Fanchon Aldrich Castro ended in divorce.

Survivors include his wife, Dr. Maryanna Dotson of Marathon; two sons from his first marriage, Alejandro Francisco Castro II of Baltimore and Robert J. Castro of Bethesda; a stepson, Gregory D. Bremer of Washington; a sister, Maria Teresa Everhart of Arlington; a brother, Benjamin Castro of Washington; and six grandchildren.

-- Patricia Sullivan

Walter George HansenTransportation Consultant

Walter George Hansen, 76, founder of a transportation planning consulting company, died of cancer May 15 at Inova Fairfax Hospital. He lived in Annandale.

Mr. Hansen co-founded Alan M. Voorhees and Associates in 1961. By the mid-1960s, it was operating worldwide. It was acquired by Planning Research, later Ashland Technology and finally AECOM Technology. He worked for each of those firms in executive positions, including chief operating officer. He retired in 1996.