▁Society , ▁with ▁members ▁from ▁more ▁than ▁ 3 5 ▁countries ▁on ▁six ▁contin ents , ▁and ▁received ▁their ▁L if etime ▁Service ▁Award ▁in ▁ 2 0 0 3 . ▁He ▁received ▁the ▁Bell rose ▁Award ▁from ▁the ▁Illinois ▁State ▁Journal - Register ▁in ▁ 2 0 0 9 ▁for ▁his ▁lifetime ▁achiev ements ▁in ▁natural ▁resources . ▁ ▁Stern berg ▁has ▁cultiv ated ▁and ▁studied ▁trees ▁since ▁ 1 9 5 2 ▁and ▁has ▁assemble d ▁one ▁of ▁the ▁largest ▁PC N ▁o ak ▁genus ▁( Qu erc us ) ▁living ▁reference ▁collections ▁for ▁North ▁America ▁at ▁Star hill ▁Forest , ▁his ▁research ▁ar bor et um . ▁He ▁has ▁developed ▁and ▁introduced ▁more ▁than ▁ 2 0 ▁tree ▁cultiv ars . ▁He ▁and ▁his ▁wife ▁Ed ie ▁grow ▁more ▁than ▁ 2 5 0 0 ▁acc ession ed ▁tax a ▁of ▁wo ody ▁plants ▁at ▁Star hill ▁Forest . ▁The ▁ar bor et um ▁is ▁described ▁in ▁the ▁American ▁Association ▁of ▁Museum s ▁Directory , ▁the ▁American ▁H ort icult ural ▁Society ' s ▁North ▁American ▁H ort icult ure ▁Reference ▁Guide , ▁and ▁Jacob s ' ▁Gard ens ▁of ▁North ▁America ▁and ▁Hawai i , ▁and ▁was ▁featured ▁in ▁the ▁ 1 9 9 4 ▁educational ▁film ▁The ▁Gre end ay ▁K ids ▁Lear n ▁About ▁Tre es ▁and ▁a ▁ 2 0 0 7 ▁P BS ▁special ▁for ▁Illinois ▁St ories , ▁W SE C ▁TV . ▁It ▁was ▁one ▁of ▁ 3 0 ▁world wide ▁ar bor