Question: What type of details about george de mohrenschildt can be gathered from the following bio? Bio: george sergius de mohrenschildt -lrb- ; april 17 , 1911 -- march 29 , 1977 -rrb- was a petroleum geologist and professor who befriended lee harvey oswald in the summer of 1962 and maintained that friendship until oswald 's death , two days after the assassination of us president john f. kennedy . his testimony before the warren commission investigating the assassination was one of the longest of any witness .
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