jacob feedback vince chonawee tom halliburton feedback jacob tom feedback pros actually simple called trading system actually scheduling system impression jacob good selling knowledge finance derivatives limited zimin forwarded zimin lu hou ect 04 11 2001 03 31 pm chonawee supatgiat enron 03 21 2001 07 28 pm zimin lu hou ect ect cc tom halliburton corp enron enron subject jacob feedback asked jacob two questions check basic knowledge answered correctly optimization question believe good foundation optimization skill doubt stochastic skill took one course stochastic processes previous models simple deterministic models interview time would able check stochastic modeling skills completely failed answer second question check basic risk management skill clear weak background finance risk management understand relationship discount rate risk showed weakness annuity calculation conclusion feel good basic optimization weak background finance based experiences doubt advance optimization skills stochastic skill ability attack complex optimization problem would recommend second round interview solving complex optimization problem chonawee