▁the ▁court ▁finding ▁him ▁guilty . ▁St ains ▁states ▁that ▁P ender gr ast ▁" has ▁done ▁met icul ous ▁background ▁work ... ▁and ▁he ▁provides ▁material ▁background ▁for ▁answering ▁any ▁question ▁one ▁may ▁pose ▁to ▁him ". ▁ ▁Non - f iction ▁ ▁Children ' s ▁literature ▁ ▁References ▁ ▁External ▁links ▁▁▁▁▁ ▁Stuart ▁A . ▁Rose ▁Man us cript , ▁Archives , ▁and ▁R are ▁Book ▁Library , ▁Em ory ▁University : ▁Mark ▁P ender gr ast ▁research ▁files , ▁circa ▁ 1 8 8 0 - 2 0 0 9 ▁ ▁Category : American ▁science ▁writers ▁Category : American ▁li br ari ans ▁Category : 1 9 4 8 ▁birth s ▁Category : L iving ▁people ▁Category : Ind ep endent ▁sch ol ars ▁Category : Har vard ▁College ▁al umn i <0x0A> </s> ▁The ▁Senior ▁White head ▁Prize ▁of ▁the ▁London ▁Mathemat ical ▁Society ▁( L MS ) ▁is ▁now ▁awarded ▁in ▁odd ▁number ed ▁years ▁in ▁memory ▁of ▁ ▁John ▁Henry ▁Const antine ▁White head , ▁president ▁of ▁the ▁L MS ▁between ▁ 1 9 5 3 ▁and ▁ 1 9 5 5 . ▁The ▁Prize ▁is ▁awarded ▁to ▁mathemat icians ▁normally ▁resident ▁in ▁the ▁United ▁Kingdom ▁on ▁ 1 ▁January ▁of ▁the ▁relevant ▁year . ▁Selection ▁criteria ▁include ▁work ▁in , ▁influence ▁on ▁or ▁service ▁to ▁mathematics , ▁or ▁recognition ▁of ▁lect uring ▁g ifts ▁in ▁the ▁field ▁of ▁mathematics . ▁Pre vious ▁recip ients ▁of ▁top ▁L MS ▁pri zes ▁or ▁med als ▁are ▁in el