ermann ▁( 2 0 1 3 – 2 0 1 7 ) ▁and ▁Andrea ▁N ah les ▁( 2 0 1 7 – 2 0 1 9 ). ▁ ▁In ▁the ▁negoti ations ▁to ▁form ▁a ▁coal ition ▁government ▁under ▁the ▁leadership ▁of ▁Chan cell or ▁Ang ela ▁Mer kel ▁following ▁the ▁ 2 0 1 7 ▁federal ▁elections , ▁M üt zen ich ▁was ▁part ▁of ▁the ▁working ▁group ▁on ▁foreign ▁policy , ▁led ▁by ▁Urs ula ▁von ▁der ▁Le yen , ▁G erd ▁Müller ▁and ▁Sig mar ▁Gabriel . ▁ ▁In ▁June ▁ 2 0 1 9 ▁M üt zen ich ▁became ▁acting ▁chairman ▁of ▁the ▁SP D ▁parliament ary ▁group ▁after ▁the ▁start ling ▁dem ission ▁of ▁Andrea ▁N ah les . ▁ ▁Other ▁activities ▁ ▁Max ▁Plan ck ▁Institute ▁for ▁the ▁Study ▁of ▁Soci eties ▁( M PI f G ), ▁Member ▁of ▁the ▁Board ▁of ▁Trust ees ▁( since ▁ 2 0 0 9 ) ▁ ▁Zeitschrift ▁für ▁Auß en - ▁und ▁S icher heit sp olit ik , ▁Member ▁of ▁the ▁Ad vis ory ▁Board ▁( since ▁ 2 0 0 9 ) ▁ ▁German ▁United ▁Services ▁Trade ▁Union ▁( ver . di ), ▁Member ▁ ▁Development ▁and ▁Peace ▁Foundation ▁( SE F ), ▁Member ▁of ▁the ▁Board ▁of ▁Trust ees ▁( 2 0 1 3 - 2 0 1 9 ) ▁ ▁German ▁Institute ▁for ▁International ▁and ▁Security ▁Affairs ▁( SW P ), ▁Member ▁of ▁the ▁Council ▁( 2 0 0 9 - 2 0 1