What is the relationship between Richard Tol and University of Sussex in the context of the input sentence. Choose an answer from: 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.

Richard Tol of the University of Sussex points out that homes and offices in cold countries are built to conserve heat, with large south-facing windows.

Answer: employer