Adviser and referee, on literature in English (particularly that of the Renaissance) for publishers of learned journals and periodical publications. Member of the International Editorial Board of Parergon (Journal of the Australian and New Zealand Association for Medieval and Early Modern Studies). Member of the (international) Advisory Board of "Digital Renaissance Editions". Supplier of information about visual art objects to a number of Australian museums and art galleries. My wife Truus and I gifted the Daalder Contemporary Jewellery Collection to the Art Gallery of South Australia in 2017. We are, as governors, members of the Gallery's Foundation. We regularly lend art objects to such institutions as the Museum of Applied Arts and Sciences in Sydney and the National Gallery of Australia. I also contribute to Facebook with regularity, usually on the visual arts. My wife is known for her books on the visual arts, notably her Ethnic Jewellery and Adornment (2009).