10:01 PM EDT 10/16/2013
Originally posted 03/08/2013 03:00PM
After clocking in at at the Dunder Mifflin Paper Company for nearly 10 years, Brian Baumgartner knows a thing or two about mixing work and play.
But even as The Office prepares to wrap its ninth and final season, the Kevin Malone actor is still not sick of his colleagues, who make the series' finale a bittersweet goodbye.
"Mine and, really, everyone's life has changed so much over this decade," Baumgartner, 40, told PEOPLE after serving as the grand marshal at Sunday's Subway Fresh Fit 500 race. "We've all grown up together. Our lives have all changed together. We've seen weddings and divorces and kids, success and failure."
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