Ian Maddieson was born on September 1, 1942 in Watford, UK, and died suddenly on February 2, 2025 in Albuquerque, New Mexico, USA. He leaves a legacy of groundbreaking work in the typology of phonological inventories (e.g. Maddieson Reference Maddieson1984, Maddieson et al. Reference Maddieson, Flavier, Marsico, Coupé and Pellegrino2013) and the phonetic documentation of understudied sounds from a wide range of languages (e.g. Ladefoged & Maddieson Reference Ladefoged and Maddieson1996). Though nominally retired for almost 20 years, he had remained active in research and teaching; at the time of his death he had just returned from Paris where he had served on a doctoral committee.

Ian was the youngest of four children. His family ran a seaside holiday camp in Kent (a later version of which can be seen in a Youtube video (Isle of Wight 2021)), but were evacuated during the war, and so Ian was born near London. He attended Exeter College Oxford, studied the history of the English language, and graduated in 1964. Over the next few years he taught in Ghana, Oxford, Nigeria, and Indiana (USA), and took MA courses at the School of Oriental and African Studies in London. In 1973, at the invitation of Vicki Fromkin and Peter Ladefoged, he came to the University of California at Los Angeles (UCLA) Phonetics Lab as a researcher on tone, and then for 6 months worked at Stanford University on Charles Ferguson and Joseph Greenberg’s Language Universals Project. Back at UCLA in 1975, he enrolled in the Ph.D. program in Linguistics under Peter Ladefoged’s supervision, and received the degree with a dissertation on Universals of Tone: Six Studies (Maddieson Reference Maddieson1977). He remained at UCLA as an adjunct professor/research linguist until 1999, when he moved to the Linguistics Department at UC Berkeley. In 2006 he retired from Berkeley so that he could move to the University of New Mexico, where his wife Caroline Smith is a linguistics professor.

Ian is perhaps best known for the UCLA Phonological Segment Inventory Database (UPSID), and his 1984 book about it, Patterns of Sounds (Maddieson Reference Maddieson1984). There he compiled vowel and consonant inventories from 317 languages and used them to report on questions like which sounds are most or least common, which are most or least likely to co-occur, and to speculate on why. An important early paper of this sort was Lindblom and Maddieson (Reference Lindblom, Maddieson, Li and Hyman1988), on the dimensionality of consonant inventories across languages, which continues to provide an insightful way of thinking about inventories of different sizes within an overall phonetic space.

Throughout the 1980s he worked with Kristin Precoda to add over 40% more languages to the UPSID dataset, to format it into a flexible database, and to provide tools for mining that database (Maddieson & Precoda Reference Maddieson and Precoda1990). Phoneticians and phonologists around the world continue to use this resource.

At UCLA Ian found shared interests with Jean-Marie Hombert in language evolution and history, and after Jean-Marie moved to the University of Lyon-2 in 1980, Ian (and later, Caroline) frequently visited him and his Laboratoire Dynamique du Langage. These visits led to regular collaborations over the years, further developing the UPSID materials and exploring language complexity. The Lyon-Albuquerque Phonological Systems Database, or LAPSyD (Maddieson et al. Reference Maddieson, Flavier, Marsico, Coupé and Pellegrino2013), is an extension of UPSID, not just by including more languages, but more importantly by including more kinds of information about each language. Ian also contributed 13 chapters to the World Atlas of Language Structures, or WALS (Haspelmath et al. Reference Haspelmath, Dryer, Gil and Comrie2005; Dryer & Haspelmath Reference Dryer and Haspelmath2013), including several on segment inventories as well as chapters on syllable structure and tone (e.g. Maddieson Reference Maddieson, Dryer and Haspelmath2013). And he continued to develop observations about potential phonetic universals from these data (e.g. Maddieson Reference Maddieson, Hardcastle and Laver1997, Reference Maddieson2006, Reference Maddieson2023).

Ian and Peter Ladefoged had a long-term collaboration on ‘Sounds of the World’s Languages’ which resulted in their landmark 1996 book (Ladefoged & Maddieson Reference Ladefoged and Maddieson1996). This monumental work provides instrumental phonetic documentation, sometimes from the literature but often from their own research, of all the sound types known to occur in languages. Then, as Ian said on his website, ‘in part guided by the gaps in knowledge we discovered during this project, [we] followed this with (…) work on the phonetics of endangered languages.’ Both of these projects involved fieldwork around the world. Over two decades Ian published, often with graduate students, on a wide range of sounds and languages (e.g. Maddieson Reference Maddieson1989) – the sound types included bilabial trills, labio-coronals, palato-alveolar affricates, clicks, tones; and the languages included, among others, Amis, Avatime, Berber, Bura, Burmese, Chaga, Dahalo, Ewe, Hadza, Iaai, Lai, Ndumbea, Paicĩ, Sele, Sherpa, Shona, Sukuma, Tiwi, Tlingit, Tsat, Tsez, and Yapese.

Other topics that interested him over his long career included voice production and phonation types, borrowed sounds, phonetic cues to syllabification, consonant voicing effects on f0, gestural economy, tone spacing, East Bantu syntax, Gikuyu morphosyntax, language history and linguistic description in Africa, and automatic language recognition.

Ian interacted with many students over the years, teaching and collaborating, and he chaired or co-chaired several masters theses and doctoral dissertations. He mentored students especially on phonetic fieldwork and laboratory phonetic analysis of fieldwork recordings.

Ian was also known as a committed and successful runner. He ran track and cross-country at school and university, but found his passion in long-distance running, especially over rough terrain. His first 50-mile race was the American River 50 in 1980, and his first 100-mile race was the Western States Endurance Race in 1982. He is one of 35 people who finished the latter race 10 times in under 24 hours. He and Caroline were married just after the Vermont 100 mile race in 2004.

Ian was a life member of the International Phonetic Association and a member of the Council for 30 years. He was active in the preparation for the 1989 Kiel Convention (e.g. Maddieson Reference Maddieson1987), and headed the suprasegmentals working group (e.g. Maddieson Reference Maddieson1990). He later served on the Executive Council as Vice-President (2003–2007) and as Editor of our Journal (1989–1995). He was a founding member of the Association for Laboratory Phonology and served as its first secretary (2010–2012). In 2013 he was elected a fellow of the American Association for the Advancement of Science (AAAS).

An online memorial was held on February 22, 2025, and the presentations delivered there have been edited and published by Keith Johnson (Reference Johnson2025).