A visitation for Dr. Doris Ridder, director of the Regional Professional Development Center at Missouri S&T, will be held from 2-8 p.m. Wednesday, May 21, at Gottenstroeters Funeral Home in Owensville, Mo. The funeral service will begin at 11 a.m. Thursday, May 22, at Zion St. Paul Church in Bay, Mo. Dr. Ridder died Monday, May 19.