▁adj unct ▁professor ▁at ▁American ▁University ' s ▁Washington ▁College ▁of ▁Law . ▁She ▁then ▁joined ▁the ▁Office ▁of ▁General ▁Coun sel ▁for ▁the ▁Department ▁of ▁Energy / F eder al ▁Energy ▁Administration , ▁and ▁in ▁ 1 9 7 9 ▁became ▁the ▁Office ' s ▁deput y ▁assistant ▁general ▁coun sel ▁for ▁Fin an cial ▁In cent ives , ▁Office ▁of ▁General ▁Coun sel . ▁ ▁From ▁ 1 9 8 1 ▁to ▁ 1 9 8 6 , ▁she ▁worked ▁in ▁the ▁United ▁States ▁Department ▁of ▁the ▁Inter ior , ▁where ▁she ▁assist ed ▁the ▁Associ ate ▁Sol ic itor ▁and ▁helped ▁admin ister ▁the ▁Sur face ▁M ining ▁Control ▁and ▁Rec lam ation ▁Act ▁of ▁ 1 9 7 7 . ▁In ▁ 1 9 8 5 , ▁Horn ▁was ▁promoted ▁to ▁principal ▁deput y ▁solic itor , ▁where ▁she ▁super vised ▁all ▁the ▁Regional ▁and ▁Field ▁Off ices ▁of ▁the ▁Sol ic itor ' s ▁Office ▁in ▁the ▁Department ▁and ▁acted ▁as ▁the ▁chief ▁lawyer ▁to ▁the ▁Secretary ▁and ▁Under ▁Secretary ▁of ▁the ▁Department ▁of ▁the ▁Inter ior . ▁ ▁Federal ▁jud icial ▁service ▁In ▁ 1 9 8 6 , ▁President ▁Ron ald ▁Re agan ▁appointed ▁Horn ▁as ▁judge ▁of ▁the ▁United ▁States ▁Court ▁of ▁Federal ▁Cla ims . ▁She ▁was ▁re app oint ed ▁by ▁President ▁George ▁W . ▁Bush ▁in ▁ 2 0 0 3 ▁and ▁assumed ▁senior ▁status ▁on ▁March ▁ 9 , ▁ 2 0 1 8 . ▁ ▁Personal ▁life ▁Judge ▁Horn ▁is