Singer has said his financial relationships do not influence his research .
She writes that he has been a paid consultant for many years for ARCO , ExxonMobil , Shell , Sun Oil Company , and Unocal , and that SEPP has received grants from ExxonMobil .
Singer has said consultant 's financial relationships do not influence his research .
She writes that he has been a paid consultant for many years for ARCO , ExxonMobil , Shell , Sun Oil Company , and Unocal , and that SEPP has received grants from ExxonMobil .