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and Atmospheric Administration. During the 1980s and early 1990s, he served on the Environmental Engineering Committee of the U.S. Environmental Protection Agency’s Scientific Advisory Board and the Water Science and Technology Board of the National Research Council.

Perhaps it is Don’s legacy as a teacher of so many members of our profession that will stand as his greatest achievement. Over his five decades at Manhattan College, he combined a remarkably clear teaching style with an infectious excitement and enthusiasm for environmental engineering. His chalk renderings on the blackboard reminded us of the scenic artist that he could have been, and his tales of consulting experiences from around the world kept us glued to our seats. But it was his enthusiasm for using mathematics to solve real-world problems that was most contagious. Don opened our minds to the many dynamic processes affecting streams, lakes, and estuaries through the beauty of mathematical modeling for which we are all forever grateful.

Don is survived by his children—Dennis O’Connor, Arlene O’Connor Bell, and Jeanette O’Connor—and by two grandchildren, Christopher and Kristin, as well as by many of his former colleagues and students whom he deeply inspired during his wonderful career.

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