History. CSL Behring is a member of the CSL Group of companies. Parent company CSL Limited (ASX: CSL) is a specialty biopharmaceutical company headquartered in Parkville, Australia. As part of a global alignment, the CSL Behring brand was established in 2007. Previously known as ZLB Behring, the company's history dates back to 1904. CSL Behring traces its heritage back to Emil von Behring, the inventor of serum therapy or serology.