Ray K. Hacker, 90, of Lititz, Pa., died Feb. 3, 2021, at Landis Homes Retirement Community. He was born Aug. 7, 1930, to Albert and Pearl (Kaiser) Hacker in Milford Township.

He graduated from Kutztown State College in 1952 with a bachelor’s degree in education. He earned a master’s degree in library science in 1956 from the University of Michigan.

He was employed as a librarian at Millersville University of Pennsylvania for 37 years until his retirement as associate professor of library in 1994. He was acting director of the library from 1982 to 1985 and chair of the library department from 1976 to 1983. He made significant contributions to organize Ganser Library’s collections. Previous to Millersville, he served as a librarian at Rider College in New Jersey, Mennonite Biblical Seminary and West Chester University.

He was a member of Bethel Mennonite Church in Lancaster, where he served as a deacon for about 25 years and wrote the History of Bethel Mennonite Church, 1947-1972. He and Agnes then worshiped at Akron Mennonite Church. He led adult Sunday school classes, especially lessons related to biblical history. He was a delegate at General Conference Mennonite Church meetings and attended at least seven Mennonite World Conference gatherings.

He was a founding member and first president of Mennonite Historians of Eastern Pennsylvania. With MHEP, he organized 37 historical tours in several states and Canada. He served for more than 35 years on the board of the Germantown Mennonite Historic Trust.

He was a longtime resident of East Petersburg Borough before relocating to Landis Homes in 2016. He served on the Hempfield School Board in the late 1990s and early 2000s.

He loved to organize family vacations and took great joy in reading, writing journals and doting on his grandchildren.

Survivors include his wife of 62 years, Agnes (Rosenfeld) Hacker; four children, Cheryl (Jeffrey Ferriell) Hacker of Columbus, Ohio, R. Scott (Cindy) Hacker of Missoula, Mont., Douglas (Vickie) Hacker of San Diego, Calif., and Susan Freitag of Summerfield, Fla.; five siblings, Betty, Roland, Mary, Janice and Ernest; and four grandchildren.

He was preceded in death by a brother, A. Floyd Hacker.