Hellinger's position at Evanston throughout the war was precarious with a series of one-year appointments but he acquired American citizenship in 1944 and worked at Evanston until 1949 when he retired.
Hellinger posisyon sa Evanston sa kabuuan ng digmaan ay tiyak na may isang serye ng mga isang-taon na pakikipagtipan ngunit siya nakuha American citizenship in 1944 at nagtrabaho sa Evanston hanggang 1949 kung kailan siya nagretiro.