<Tr> <Td> 2012 </Td> <Td> Animal Practice </Td> <Td> Sarah </Td> <Td> 1 episode </Td> </Tr> <Tr> <Td> Jessie </Td> <Td> Cassandra Chesterfield </Td> <Td> Episode: "101 Lizards" </Td> </Tr> <Tr> <Td> 2013 </Td> <Td> Switched at Birth </Td> <Td> Parker Robinson </Td> <Td> 3 episodes </Td> </Tr> <Tr> <Td> 2014--2017 </Td> <Td> The Big Bang Theory </Td> <Td> Emily Sweeney </Td> <Td> <Ul> <Li> Recurring role (season 7--8), 11 episodes </Li> <Li> Main role (season 9), 5 episodes </Li> <Li> Guest role (season 10), episode: "The Emotion Detection Automation" </Li> </Ul> </Td> </Tr>

Who is the redhead on big bang theory