▁R ett ig ▁held ▁leadership ▁roles ▁in ▁a ▁number ▁of ▁professional ▁organizations . ▁He ▁was ▁President ▁of ▁the ▁American ▁College ▁of ▁Tax ▁Coun sel ▁( ACT C ); ▁was ▁Chair ▁of ▁the ▁ 4 , 0 0 0 + ▁member ▁Tax ation ▁Section ▁of ▁the ▁State ▁Bar ▁of ▁California ▁from ▁ 1 9 9 9 ▁to ▁ 2 0 0 0 ; ▁the ▁long time ▁Chair ▁of ▁the ▁U CLA ▁Ext ension ▁Ann ual ▁Tax ▁Cont ro vers y ▁Institute ; ▁and ▁served ▁as ▁Vice - Ch air , ▁Administration , ▁for ▁the ▁ 1 2 , 0 0 0 + ▁member ▁Tax ation ▁Section ▁of ▁the ▁American ▁Bar ▁Association . ▁▁ ▁In ▁ 2 0 1 0 – 2 0 1 1 , ▁R ett ig ▁was ▁appointed ▁by ▁the ▁I RS ▁to ▁serve ▁as ▁Chair man ▁of ▁the ▁I RS ▁Ad vis ory ▁Council ▁( IR S AC ) ▁for ▁the ▁last ▁year ▁of ▁his ▁three - year ▁term . ▁The ▁I RS AC ' s ▁primary ▁purpose ▁is ▁to ▁provide ▁an ▁organized ▁public ▁forum ▁for ▁senior ▁I RS ▁execut ives ▁and ▁represent atives ▁of ▁the ▁public ▁to ▁discuss ▁relevant ▁tax ▁administration ▁issues . ▁ ▁In ▁his ▁home ▁state ▁of ▁California , ▁R ett ig ▁was ▁a ▁long time ▁member ▁of ▁the ▁California ▁F TB ▁Ad vis ory ▁Board . ▁He ▁was ▁designated ▁a ▁Cert ified ▁Special ist ▁in ▁Tax ation ▁Law ▁by ▁the ▁State ▁Bar ▁of ▁California , ▁Board ▁of ▁Leg al ▁Special ization ▁and ▁also ▁designated ▁a ▁Cert ified