The Rev. Walton Glenn (Jack) Dean, 56, pastor of Grace Baptist Church in Bowie for the past 15 years, died of a brain tumor Tuesday at The John Hopkins Hospital in Baltimore.

Following his ordination in 1938, Mr. Dean served as the pastor of churches in Arkansas and Texas. He moved to the Washington area in 1964, when he was named pastor of Grace Baptist Church.

Mr. Dean, who worked with young people on both the community and church levels, initiated the now-defunct "Future Hope Singers" a church-sponsored youth group that performed locally and in nearby states. He also established the church's annual practice of presenting religious tableaus, called "Christmas in Living Pictures."

Mr. Dean, who lived in Bowie, was active in the American Baptist Association, where he had served as assistant publicity director for nearly 10 years and supervised publications of the Association's Sunday School Committee for more than 14 years.

In 1969, he was elected president of the newly formed Mid-Atlantic Baptist Association and served as its president until 1974.

Mr. Dean was born in Mountain View, Okla., and attended the Missionary Baptist Seminary in Little Rock.

Survivors include his wife, Maxine, of Bowie; a daughter, Jacqueline Byrd of Bowie; his mother, Lillie Dean, and a sister, Sara Grigg, both of Lubbock, Tex.; two other sisters, Juanita Sewell of Brownfield, Tex., and Myrtle Glasscock of Sydney, Tex.; a brother, Ben, of Dallas, and two grandchildren.