Lebowitz will handle all financial operations and act as human resources executive for the Los Angeles office.
He previously held senior executive posts at the television groups of Sony and Paramount, and also served at Stone Canyon Entertainment and HarperCollins Publishing.
'To be able to hire a CFO of Mark's calibre is a testament to the growth of Liberation within our first 12 months of operation,' Liberation's chairman Jay Boberg said.
'I consider Mark's experience in content at both Sony Television and Paramount invaluable to us as we execute our worldwide game plan to purchase and develop new product to add to our already timeless content library.'
Boberg launched the company in 2006 with the backing of media and communications private equity firm Clarity Partners.