Ellen "Puffin" D'Oench, curator emerita of the Davison Art Center, adjunct professor of art history emerita, and former trustee of Wesleyan University died May 22 in Middletown. She was 78 years old and had been ill for some time. D'Oench interrupted her education at Vassar College to marry Russell "Derry" D'Oench and raise their family. She completed her undergraduate education at Wesleyan in 1973, graduating magna cum laude and Phi Beta Kappa in the same class as her son Peter. She received a Ph.D. from Yale University in 1979. D'Oench was Curator of the Davison Art Center from 1979 until…