Joanna Louise Fowler, a daughter of Dr. and Mrs. Howland Auchincloss Fowler of Bethesda, Md., was married yesterday to Eric Carl Jonsson, a son of Mr. and Mrs. Allan R. Jonsson of Honolulu. The Rev. D. Worth Carson performed the ceremony at the National Presbyterian Church in Washington. Mrs. Jonsson, 27 years old, will begin work in September as an investment analyst for the Capital Research Company in San Francisco. She graduated from Princeton University and received an M.B.A. degree from Stanford University. Her father is a physicist at the National Institute of Standards and Technology in Gaithersburg, Md. The bridegroom, 33, is a financial analyst at the Bechtel Group Inc. in San Francisco. He graduated from Stanford University where he received an M.B.A. degree. His father is a vice president of Hawaiian Tug and Barge in Honolulu.