Alek Skarlatos was born october 10, 1992 in Castro Valley, California to Emanuel Skarlatos, a Greek immigrant who arrived in the United States as a child and then-wife, Heidi Hansen. His step-parents are Karen Skarlatos and Tom Hansen respectively. During his childhood, he grew up in Sacramento County, California, where he met Spencer Stone and Anthony Sadler while attending school in Fair Oaks, California, continuing their friendship into adulthood. All three men are described as sharing "a deeply religious background and a belief in service to their community" and are Christian. Skarlatos graduated from Roseburg High School. Skarlatos joined the Oregon Army National Guard in 2012 achieving the rank of Specialist. He completed a nine-month deployment in Afghanistan with the 186th Infantry Regiment, 41st Infantry Brigade Combat Team of the Oregon Army National Guard in 2015. The acting adjutant general of Oregon has referred to Skarlatos as "a true citizen soldier who displayed the courage each of us would hope to find in ourselves." Spc. Skarlatos had reenlisted for an additional two-years a month prior to the terrorist event on a French train in 2015 and left military service in November 2017. In October 2016, it was announced that Skarlatos, Spencer Stone and Anthony Sadler would make an appearance on Who Wants to Be a Millionaire as a part of the show's special "Hometown Heroes" week which would premiere on October 31, 2016.

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