In 2004, Lehman launched FIRST JASON, named for his distinction in playing the first Jason Voorhees of the iconic horror film "Friday the 13th, " and has been melting faces ever since, slashing machete to metal with his keytar. His boot-stomping music includes elements of jazz, rock, Afrobeat, Middle Eastern, classical, reggae, classical, and punk. Lehman has been entertaining audiences in a variety of venues across the country, UK, and in Europe. FIRST JASON has supported many major acts including ICE NINE KILLS, AVATAR, IN THIS MOMENT, INCANTATION & TWIZTID.

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First Jason has independently released fpur albums: Jason is Watching! (2009), with Chuck Lescewicz "Nefarious" from Chicago death metal band Macabre playing bass, and Amit Shamir "Cleaver" from New York hardcore band Cro-Mags on drums and "Heed My Warning,"(2013), described by Uber Rock (UK) as "a brand of thinking man's horror-themed rock." “To Be a Monster” (2017) and their most popular album to date “LORD OF THE LAKE” (2019) that contains the hits “KILL FOR MOTHER” and “VOORHEES IS THE NAME” which both have videos up on YouTube. Currently FIRST JASON has recorded two new songs that released recently called “THE PRICE OF PEACE” & “THE SCAPEGOAT”.