As a young independently operating lawyer in 1969, Prof. Dr. Gerald Rittershaus accepted cases from all areas of law, but mainly civil, commercial and corporate law. He only began specialising in company law in the broadest sense at the beginning of the 1970s. He then focused on providing advice on company acquisitions and disposals, company formations and on providing companies with support in their development and financing, also on banking law and sports law, the latter mainly in international motorcycle racing to which he had a special relationship due to his own active involvement in national motor sports. He regularly went on business trips abroad due to various mandates in North and South America, mostly in connection with exploration activities in the oil and gas sectors and in mining. The same applied to his representation of German companies in Spain. Besides his advisory work, he also sat on numerous supervisory and advisory boards in banking, financing and trade, some of which were abroad. Gerald Rittershaus surrendered his licence to practise law at the age of almost 78 years.