<Table> <Tr> <Th colspan="2"> Grisha `` G . '' Callen </Th> </Tr> <Tr> <Td colspan="2"> NCIS : Los Angeles character </Td> </Tr> <Tr> <Td colspan="2"> Chris O'Donnell as G. Callen </Td> </Tr> <Tr> <Th> First appearance </Th> <Td> `` Legend ( Part 1 ) '' </Td> </Tr> <Tr> <Th> Portrayed by </Th> <Td> Chris O'Donnell </Td> </Tr> <Tr> <Th> Other appearances </Th> <Td> <Ul> <Li> NCIS -- `` Legend ( Part 2 ) '' </Li> <Li> Hawaii Five - 0 -- `` Pa Make Loa '' </Li> </Ul> </Td> </Tr> <Tr> <Th colspan="2"> Information </Th> </Tr> <Tr> <Th> Full name </Th> <Td> Grisha Alekandrovich Nikolaev Callen </Td> </Tr> <Tr> <Th> Nickname ( s ) </Th> <Td> G . </Td> </Tr> <Tr> <Th> Occupation </Th> <Td> NCIS Special Agent </Td> </Tr> <Tr> <Th> Title </Th> <Td> Special Agent - in - Charge </Td> </Tr> <Tr> <Th> Family </Th> <Td> <Ul> <Li> Nikita Alexsandr Reznikov ( father ) </Li> <Li> Clara Callen ( mother , deceased ) </Li> <Li> Amy Callen ( older sister , deceased ) </Li> <Li> George Callen ( grandfather , deceased ) </Li> <Li> Alexandra Reynolds ( half sister ) </Li> </Ul> </Td> </Tr> <Tr> <Th> Significant other ( s ) </Th> <Td> <Ul> <Li> Kristen Donnelly ( ex-girlfriend ) </Li> <Li> Joelle Taylor ( ex-girlfriend ) </Li> <Li> Anna Kolcheck ( girlfriend ) </Li> </Ul> </Td> </Tr> <Tr> <Th> Nationality </Th> <Td> American </Td> </Tr> </Table>
what does g stand for in ncis los angeles
Grisha