Eryk started his career with Lorne Michaels' Broadway Video, where he produced Sharon, Lois and Bram's CANDLES, SNOW and MISTLETOE for CBC, LASSIE'S 40TH TV ANNIVERY SPECIAL and the long-running hit FROSTY RETURNS, now in its 24th year on CBS.

Casemiro left Broadway Video in 1996 to serve as SVP of Creative Affairs at Klasky-Csupo Productions where he was responsible for the development and production of television series such as RUGRATS, THE WILD THORNBERRYS, ROCKET POWER, AS TOLD BY GINGER, and ALL GROWN UP, earning the studio three Ark Trust Awards, Four Humanitas Awards, 10 Emmy nominations, and one Emmy Award. In this role he also led the development and production of feature films for Paramount Pictures including RUGRATS GO WILD and THE WILD THORNBERRYS MOVIE, which earned an Academy Award nomination for Best Song, RUGRATS IN PARIS, and THE RUGRATS MOVIE, which when released was the first animated film outside of Disney to earn more than $100,000,000.

For the next nine years, Eryk worked as a writer/producer on OLIVIA, based on Ian Falconer's award-winning book; POPPY CAT, adapted from illustrator Lara Jones' picture book series and currently seen in 170 across the globe; and THE MR. MEN SHOW, adapted from Roger Hargreaves' Little Miss and Mr. Men book series, for which Eryk received his 11th Emmy nomination, this time for Best Writing in a Children's Series.

In November of 2012, Eryk accepted the newly-created role of Chief Creative Officer for Marathon Media, overseeing the production of GET BLAKE for Nickelodeon Global and LOLIROCK, a co-production with Disney and France Televisions and now a massive hit in China. Months later, he assumed the role of Chief Creative Officer for the newly amalgamated Zodiak Kids Studios, comprised of Marathon Media and Tele-Image in Paris, and the Foundation in London. In this capacity, Eryk produced KODY KAPOW for Sprout NBC/ Universal; LILYBUDS for France Televisions and Discovery Kids Latin America; MAGIKI for DeA Kids and Planeta.