Grega Mastnak graduated in painting from the Ljubljana Academy of Art. While studying, he made his first animations, published his first comics and for a number of years, contributed his works to the Mladina magazine. Between 1997 and 2001, he drew and wrote three lengthy comics for PIL and PIL+ magazines. In this period he also had several solo exhibitions. Between 2002 and 2009, he worked intensely on the animation series The Beezes as director, screenwriter and lead animator. In 2010, he founded his own production company OZOR, where he works on animation series, Prince Ki-Ki-Do. His works have earned him a number of awards in Slovenia and internationally.