He wrote more than 400 publications on civil law, mercantile law, company law and commercial law, as well as legal theory, neuro-jurisprudence and psychology. Weimar was the editor of the scientific journal series Commercial Law and Economic Constitution of the Institute for Commercial Law and Commercial Legislation in Siegen (Germany), writings on neuro-jurisprudence (Germany), co-editor of the Travaux scientifiques de la Faculté Européenne des Sciences du Foncier Strasbourg (France), co-founder of Theory and Practice – Contributions to the Complete Land Law (Germany), co-editor of Contributions to General Legal and Political Doctrine (Germany), co-founder of the Salzburg Journals on Legal, State and Social Philosophy (Austria), co-editor of the Journals of Legal Psychology (Switzerland) and co-editor of the Journals of Humanity and Happiness Research (Germany). Professor Weimar was a co-founder (1991) and a board member (1991–2008) of the European Institute for Legal Psychology in Zurich.