Ben M. Angel; USA (Colonial America through Revolution and American Civil War; Spanish and Mexican periods of New Mexico through US Annexation and American Old West period), Canada (United Empire Loyalists)
David Kaleita: USA (Focus on Morrill, Morin, Colby, Chase and Stevens branches)
Maria Edmonds-Zediker: USA (Virginia from first settlement through Civil War; migrations from Virginia to Carolinas, Tennessee, Kentucky and Ohio; California Winery families, Quakers and Huguenots wherever you find them)
Justin Swanström: USA (Colonial New England & Virginia; Westward Migration; Old West; Pioneer Utah, Wyoming & Colorado; Native American)
Yigal Burstein: Israel (Jewish historical tree; arts and the sciences)
Malka Mysels: Israel (Jewish Rabbinical and historical tree; Jewish diaspora)
Rafi Kornfeld: Israel (Jewish immigration from central Europe to Israel)
Jaim Harlow: Israel (Yeshivot of Eretz Yisrael, Northern Levant, and Hijaz; Gaonim and Exilarchs of Levant, North Africa, Andalusia and Hijaz; Maimonidean Judaism; Qara'im, specific to Yeshivot)
Itai Meshulam: Israel (Pioneers of Israel; Holocaust; Israel armed forces and wars; Immigration from Bulgaria)
Europe
Eastern Europe
Hatte Blejer: Poland and Ukraine (Jewish families of Suwalki, Lomza, Volhynia, and Kherson)
Kevin Hanit: Poland (The Spiegel family of Lagow in Kielce Radom area)
Jaim Harlow: Sephardim of Zamosc, Lvov, and other areas of the Pale of Settlement, Sephardi Traders and coin minters, Jewish interaction with Lithuanian Dukes and Polish Kings
Northern Europe
Günther Kipp: Denmark, Norway, and Sweden (royal and noble families)
George Homs: France (Northern), Belgium, the Netherlands, and Luxembourg (Low Countries, 1300-1700)
Ben M. Angel; France and Belgium (Huguenots; medieval period; Frankish and Burgundian barbarians; Romans), the Netherlands (Friesland before the Dutch Revolution, interaction with the English Great Migration), and Germany (medieval; Frankish, Bavarian, and Alamannian barbarians; Carolingian transformation)