t ' s ▁son ▁Hein z ▁Wolfgang ▁Ar nd t ▁( 1 9 1 5 – 2 0 0 2 ) ▁was ▁a ▁noted ▁Australian ▁econom ist ▁based ▁in ▁Can ber ra ▁while ▁his ▁grand d augh ter ▁B ett ina ▁( born ▁ 1 9 4 9 ) ▁is ▁a ▁noted ▁Australian ▁journalist ▁and ▁sex ▁ther ap ist . ▁ ▁Ar nd t ' s ▁daughter ▁B ett ina ▁Ar nd t ▁Jess ell ▁( 1 9 1 7 – 2 0 0 3 ) ▁was ▁a ▁famous ▁paint ings ▁conserv ator ▁who ▁pract iced ▁in ▁both ▁the ▁United ▁Kingdom ▁and ▁the ▁United ▁States . ▁Jess ell ▁was ▁a ▁pri zed ▁pup il ▁of ▁the ▁ren owned ▁paint ings ▁conserv ator ▁Hel mut ▁Ru hem ann ▁( 1 8 9 1 – 1 9 7 3 ) ▁from ▁ 1 9 3 7 ▁to ▁ 1 9 3 9 . ▁Ru hem ann ▁was ▁conserv ator ▁at ▁the ▁Kaiser ▁Freder ich ▁Museum ▁in ▁Berlin ▁and ▁later ▁worked ▁on ▁paint ings ▁from ▁the ▁collections ▁of ▁the ▁National ▁Gallery , ▁T ate ▁Gallery , ▁Glasgow ▁Art ▁Gallery , ▁and ▁the ▁Cour ta uld ▁Institute . ▁Jess ell ' s ▁career ▁included ▁successful ▁private ▁stud ios ▁in ▁the ▁United ▁Kingdom ▁and ▁Washington , ▁DC , ▁USA ▁( 1 9 8 1 – 2 0 0 2 ), ▁positions ▁at ▁the ▁National ▁Gallery ▁of ▁Art , ▁Washington , ▁DC ▁and ▁the ▁Get ty ▁Museum . ▁She ▁was ▁a ▁ment or ▁to ▁count less ▁individuals . ▁Currently