KeUer-Pedersen Nuptials PlannedMr. and Mrs. Mitchell Keller of 17 Highland Ave. Rowayton have announced the forthcoming marriage of their daughter, Moira Helene, to Daniel J. Pedersen of Omaha, Neb. Mr. Pedersen is the son of Mr. and Mrs. C.B. Pedersen, also of Omaha.Ms. Keller is a graduate of Norwalk schools, and received a B.S. degree in speech cum laude from Emerson College, Boston, Mass. in 1973. Currently she is employed as an aide in psychiatric therapy at Rye Psychiatric Hospital Center, Rye, N.Y.Mr. Pedersen is a summa cum laude graduate of Boston College, where he received his B.A. and M.A. degrees in English literature. Both Ms. Keller and Mr. Pedersen spent their senior years studying literature at Manchester College, Oxford University, England, which is where they met.A wedding in late summer is planned.