Exchanges between the great range of disciplines and experts within IOE (Institute of Education), UCL's Faculty of Education and Society (University College London, UK), can be very productive. This article celebrates two professors who, in markedly different ways, have transformed interdisciplinary understanding of their chosen specialties. Some of their ideas are summarised here to encourage readers who could benefit from their publications and are not yet familiar with them to be keen to study and gain from them. Berry Mayall and Roy Bhaskar might seem too dissimilar to fit into one article. Berry worked here for nearly fifty years, Roy for only seven. One was a sociologist, working mainly on empirical research, the other a philosopher developing extremely advanced theories. Yet they both developed critical new ideas and were under-recognised within IOE despite their international influence. Roy is such a prestigious philosopher, many may wonder why a whole article is not dedicated to him. My aims include recording some benefits of the interdisciplinary thinking he promoted. This article briefly considers some of the ideas that each developed and why these are important; their collaborative work; memories from colleagues they have influenced; and their contribution to IOE's history and, potentially, to its future.