Given the input sentence, please extract the subject and object containing a certain relation in the sentence according to the following relation types, in the format of "relation1: word1, word2; relation2: word3, word4". Relations include: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

The startup already has more than 10,000 small business customers, serving over 100,000 total employees in 48 states.“Zenefits’ mission is to make it effortless for small businesses to manage their companies and employees," Zenefits cofounder and CEO Parker Conrad said in a statement.

Answer: chief_executive_officer: Zenefits, Parker Conrad