A hybrid-electric propulsion system , comprising: a power converter ; and a propulsor , comprising: a gas turbine engine having a shaft and one or more bearings supporting the shaft ; and an electric machine electrically coupled with the power converter and including a stator assembly and a rotor assembly , the rotor assembly having a rotor and a rotor connection assembly , the rotor connection assembly operatively coupling the rotor with the shaft , the rotor connection assembly having an insulated joint for interrupting common mode electric current from flowing between the rotor and the shaft , wherein the rotor connection assembly has a rotor hub and a rotor connection member , the rotor hub being connected to the shaft and the rotor connection member being connected to the rotor , the rotor hub and the rotor connection member being mechanically coupled with one another by the insulated joint , and wherein the insulated joint comprises a hub flange of the rotor hub , a connection flange of the rotor connection member , a bolt extending through the hub flange and the connection flange , and one or more insulative members electrically isolating the rotor connection member from the rotor hub . a power converter ; and a propulsor , comprising: a gas turbine engine having a shaft and one or more bearings supporting the shaft ; and an electric machine electrically coupled with the power converter and including a stator assembly and a rotor assembly , the rotor assembly having a rotor and a rotor connection assembly , the rotor connection assembly operatively coupling the rotor with the shaft , the rotor connection assembly having an insulated joint for interrupting common mode electric current from flowing between the rotor and the shaft , wherein the rotor connection assembly has a rotor hub and a rotor connection member , the rotor hub being connected to the shaft and the rotor connection member being connected to the rotor , the rotor hub and the rotor connection member being mechanically coupled with one another by the insulated joint , and wherein the insulated joint comprises a hub flange of the rotor hub , a connection flange of the rotor connection member , a bolt extending through the hub flange and the connection flange , and one or more insulative members electrically isolating the rotor connection member from the rotor hub . a gas turbine engine having a shaft and one or more bearings supporting the shaft ; and an electric machine electrically coupled with the power converter and including a stator assembly and a rotor assembly , the rotor assembly having a rotor and a rotor connection assembly , the rotor connection assembly operatively coupling the rotor with the shaft , the rotor connection assembly having an insulated joint for interrupting common mode electric current from flowing between the rotor and the shaft , wherein the rotor connection assembly has a rotor hub and a rotor connection member , the rotor hub being connected to the shaft and the rotor connection member being connected to the rotor , the rotor hub and the rotor connection member being mechanically coupled with one another by the insulated joint , and wherein the insulated joint comprises a hub flange of the rotor hub , a connection flange of the rotor connection member , a bolt extending through the hub flange and the connection flange , and one or more insulative members electrically isolating the rotor connection member from the rotor hub . <EOS>