Beechen has written scripts for various cartoon, such as Teen Titans, The Wild Thornberrys, Rugrats, Pink Panther and Pals, and The Batman. He was also the story editor on Hi-Hi Puffy Amiyumi for Cartoon Network.
Beechen has written for the Nickelodeon animated series, Edgar and Ellen, and for the short-lived drama Savannah. He is currently working on a Pink Panther remake for the Cartoon Network to air later this year.
Beechen wrote several Rugrats, The Wild Thornberrys and Rocket Power comic strips for Nickelodeon Magazine.
Beechen's first credited published work was a graphic novel named Hench, with artist Manny Bello, was published by AiT/Planet Lar in 2004. He's also written scripts for Teen Titans Go! and Justice League Unlimited for DC Comics.
Currently, Beechen is under contract with DC. He wrote issues of DC's weekly mini-series Countdown to Final Crisis and the mini-series Countdown to Adventure, featuring Animal Man, Starfire and Adam Strange, for DC. He is currently writing a Batgirl mini-series.
His follow up original graphic novel with Bello, Dugout, was released by AiT/Planet Lar in 2008. At the New York Comic Con, Wildstorm announced he would be writing a new series, Killapalooza, with Trevor Hairsine on art duties. Also at Wildstorm he took over writing Wildcats during the World's End storyline.