Claim: Bob Arum founded a company based in Las Vegas.

Robert Arum -LRB- born December 8 , 1931 -RRB- is an American lawyer , boxing promoter and businessman . He is the founder and CEO of Top Rank , a professional boxing promotion company based in Las Vegas . He also worked for the US Attorney 's Office for the southern district of New York in the tax division during his legal career before moving into boxing promotion .