Casey Holtz - is a video game designer. Casey Holtz began his career in 2016 and has worked for companies such as Sanzaru Games and SEGA. Casey Holtz's first game was Sonic Boom: Fire & Ice which was released 7 years ago. Best Game Casey Holtz contributed to was Sonic Boom: Fire & Ice. Casey Holtz's latest work is Sonic Boom: Fire & Ice which was released 7 years ago.