Daniel K. Cassel, author, History of the Mennonites
Several years ago when I started researching my husband's Ruth, Cassel, and Wismer family lines we discovered Mennonite ancestry. This information came as a surprise to the entire family as there was never any indication of this religious heritage.
Starting from scratch to locate information about Mennonite history I searched Google Books resulting in several very useful resources. Each of these volumes has been very helpful with not only explaining the origins of the Mennonite faith but also included biographies of several ancestors.
"GAMEO provides reliable information on Anabaptist-related (Amish, Mennonite, Hutterite, Brethren in Christ) topics, including history, theology, biography, institutions and local congregations. Secular topics from an Anabaptist perspective and full-text source documents are also included."
On the site were brief overviews of the following family lines: