This undated file photo shows actors in the TV series "Star Trek," from left, Leonard Nimoy as Commander Spock, William Shatner as Captain Kirk, DeForest Kelley as Doctor McCoy and James Doohan as Commander Scott. Nimoy, famous for playing officer Mr. Spock in “Star Trek” died Friday, Feb. 27, 2015 in Los Angeles of end-stage chronic obstructive pulmonary disease. He was 83. (AP Photo/Paramount Television ,File)

Leonard Nimoy struggled with how closely he was identified with his most famous role, Spock in Star Trek, during his life. And in death, Spock is still haunting him -- even in President Obama's statement on his passing:

Long before being nerdy was cool, there was Leonard Nimoy. Leonard was a lifelong lover of the arts and humanities, a supporter of the sciences, generous with his talent and his time. And of course, Leonard was Spock. Cool, logical, big-eared and level-headed, the center of Star Trek’s optimistic, inclusive vision of humanity’s future.

I loved Spock.

In 2007, I had the chance to meet Leonard in person. It was only logical to greet him with the Vulcan salute, the universal sign for “Live long and prosper.” And after 83 years on this planet – and on his visits to many others – it’s clear Leonard Nimoy did just that. Michelle and I join his family, friends, and countless fans who miss him so dearly today.