ek ▁performed ▁his ▁doctor al ▁publishing ▁his ▁Ph D ▁th esis ▁in ▁ 1 9 9 3 ▁under ▁the ▁title ▁Pattern s ▁of ▁C oca ▁consum ptions ▁in ▁Northern ▁South ▁America . ▁The ▁anth rop ologist ▁has ▁spent ▁eight ▁years ▁in ▁the ▁arch ives ▁looking ▁for ▁information ▁on ▁the ▁ind igen ous ▁pe op les ▁he ▁ass essed ▁in ▁his ▁work . ▁ ▁Since ▁ 1 9 9 2 ▁L ange ba ek ▁is ▁associate ▁professor ▁at ▁the ▁Universidad ▁de ▁Los ▁And es ▁in ▁Bog ot á ▁and ▁from ▁ 2 0 0 0 ▁to ▁ 2 0 1 1 ▁he ▁was ▁the ▁de an ▁of ▁the ▁Fac ulty ▁of ▁Social ▁Sciences ▁of ▁the ▁university . ▁ ▁L ange ba ek ▁has ▁worked ▁in ▁National ▁Park ▁T ay ron a , ▁F ú qu ene ▁Valley , ▁Bar ich ara , ▁Bah ía ▁de ▁Neg u aje ▁and ▁north ▁E cuador ▁and ▁his ▁hero es ▁are ▁Charles ▁Dar win ▁and ▁N iels ▁Bo hr . ▁ ▁Carl ▁Hen rik ▁L ange ba ek ▁has ▁stated ▁that ▁agricult ure ▁and ▁the ▁h unter - g ather er ▁society ▁are ▁not ▁mut ually ▁exclusive ▁and ▁while ▁the ▁access ▁to ▁agricult ure ▁is ▁there , ▁the ▁society ▁can ▁continue ▁living ▁off ▁h unter - g ather ing ▁techniques . ▁The ▁pot ato ▁and ▁ma ize ▁are ▁not ▁originally ▁from ▁Colombia , ▁yet ▁from ▁Peru ▁and ▁Mexico ▁respectively ▁and ▁were ▁cultiv ated ▁on ▁the ▁Al ti pl ano ▁C und ib oy ac ense ▁during ▁the ▁Herr