Rock Nominees Ltd and the company that Jeff Gravenhorst is CEO of both provide cleaning, catering and security services.
 RCO itself was in the cleaning, catering and security porterage business. 
 ISS services include: cleaning services, support services, property services, catering services, security services and facility management services. 
Jeff Gravenhorst is the Group CEO of ISS A/S, a Denmark-based global leading facility outsourcing company with more than 510,000 employees, which makes it the worlds fourth largest private employer. 
