Lethene is Library Director for the Clark County Genealogical Society in Vancouver, Washington, and teaches one or two genealogy classes a year for the society. She is also Chair of the Collections Committee for the Oregon-California Trails Association. 

She also writes occasional book reviews and articles. She is working with her daughter on an article about an ancestor who killed a man in Arkansas in 1838, changed his name and went west to California, where he lived for more than 40 years under an assumed name and worked as a physician. It is due to be published sometime in the next year.