Jennifer L. Grace and Kenneth S. Mernitz of Kenmore, members of the choir in Unitarian Universalist Church of Buffalo, were married Saturday at 4 p.m. in the church by the Rev. Daniel E. Budd. Mr. and Mrs. John D. Grace of Kenmore are parents of the bride. The bridegroom is the stepson and son of Mr. and Mrs. Walter Moeller of San Angelo, Texas, and son of the late William A. Mernitz. A reception was given in Holiday Inn, Grand Island. The couple will live in Kenmore. The bride, a graduate of Baldwin-Wallace College, has a master of music degree in voice performance from Boston University. She is an administrative assistant at Praxair Inc. and a member of Greater Buffalo Opera Company chorus. The bridegroom, an associate professor of history in Buffalo State College, is a graduate of Texas Tech University, has a master's degree and a doctorate from University of Missouri at Columbia.