[2] In 1939, prominent Mennonite theologian Harold S. Bender reached out to Landis for a variety of documents, notes, and summaries related to the Conference on Applied Nonresistance to add to the archive at Goshen College.
This interaction led to a correspondence between the two over manuscripts, images, and church records that would be sent over to Goshen from local Mennonite communities in Lancaster, Pennsylvania.
[3] In the late 1950s, Landis was entrusted with a large collection of papers from Christian E. Charles, one of the deacons at Landisville Mennonite Church.
No longer able to house these documents at his home, he founded the Lancaster Mennonite Historical Society in 1958 to store and maintain the new archive.
[5] In 1969, Landis acquired the Hans Herr House and renovated the property turning it into a Museum open to the public in 1974.