As managing director of Messe Düsseldorf Asia for over two decades, Ringling has been a part of the Messe Düsseldorf group since 1986, coming to Singapore as general manager of Messe Düsseldorf Asia from September 1995 to October 1998. Appointed in May 2000 as managing director, he is responsible for the company's strategic direction and operational management.

Messe Düsseldorf Asia is one of Asia’s most prominent exhibition organisers and a subsidiary of Messe Düsseldorf GmbH –organiser of more than 40 international trade fairs of which 20 are world no.1 trade fairs. Messe Düsseldorf Asia oversees trade fairs in the Southeast Asian region and is the regional headquarters of the Messe Düsseldorf group in Southeast Asia.

Through Ringling’s leadership, industry insight and operational expertise, this has strengthened Messe Düsseldorf Asia’s culture of innovation, expanding the company into new regional markets from Singapore, Malaysia, Thailand, Indonesia, Philippines and Vietnam, extending its productportfolio and regional reach. Instrumental in conceptualising numerous trade fairs all over Southeast Asia in various industries, such as wire and tube, printing, plastics and rubber, medical and healthcare, metallurgy and foundry, and also wines and spirits, Ringling also played a pivotal role in establishing strategic partnerships with leading international and regional industry associations for these exhibitions.

Besides the Messe Düsseldorf group he has worked with other organisers in Germany as project director for several major shows in different industries. Ringling continues to drive and champion Messe Düsseldorf Asia as a major player in the exhibition industry in Southeast Asia by keeping his fingers on the pulse of the industries in the region.