One might expect that this story of financial deprivation would be balanced from the beginning by extraordinary academic success. In fact, in the early years of primary school the future mathematics professor was thought to be backward. Despite this inauspicious start, however, at the age of 10 Jim won a scholarship to Caerphilly Boys Grammar School, a success almost unheard of in his community. On his first day in September 1944, the whole street waved him off on the train from Abertridwr to Caerphilly. At the grammar school, the educationally deprived child's world opened up: many times he has recalled the day he brought home his Latin books and peeped awestruck into this brave new world. A few years later, however, a potential disaster struck. The teenage Jim was looking out of the window at home one evening and was surprised to see, as he thought, that "they had put a second light on Aber mountain." When he looked back into the room, he saw that there was suddenly a second everything. This was the beginning of the double vision with which he lived throughout his life. He always saw two images of everything, with one image moving round the other. At first, the teenager did not dare to tell anyone, because he thought he would not be believed, but when he started falling down stairs and pouring tea into the wrong cup his mother realised that there must be a problem. The diagnosis was a minor brain haemorrhage; the prognosis extremely discouraging, with the medical profession proclaiming that he would never be able to go to university or to pursue any worthwhile activity. Naturally, Jim was not going to let that stand in his way. The only everyday activity which was closed to him was driving. Go to university he certainly did, to study mathematics at Manchester.
When Jim went north in 1951, he had never previously been out of the counties of Glamorganshire, Gloucestershire, Herefordshire and Somerset and had never seen a bathroom. At first he was horrendously homesick, but soon he warmed to the intellectual, social, and cultural opportunities offered by a university city. Jim used to go to Halle concerts in the Free Trade Hall. One occasion was the first time Jim had ever heard, either live or recorded, Beethoven's fifth Symphony: he recounted his overwhelming excitement and a feeling of "walking on air". At Manchester, Jim met a fellow mathematics undergraduate Christine. Their first meeting was at a mathematics department Christmas dance, and she was singularly unimpressed with him, but soon a friendship grew which flourished into a romance and finally a marriage, on Easter Monday, 7 April 1958. Not only were Jim and Christine fellow undergraduates but both also became research students of Bernhard Neumann. Jim and Christine Wiegold had three children, Helen, Alison and Richard.
Wiegold had graduated B.Sc. with First Class Honours in Mathematics from Manchester in 1954, then spent a year working for his M.Sc. which he received one year later. He submitted his doctoral dissertation entitled Nilpotent products of groups with amalgamations in 1958 and was awarded his Ph.D. In his thesis he combined two ideas, namely the theory of generalized free and direct products of groups with amalgamations, and the theory of nilpotent products and verbal products of groups. By the time he received his doctorate he was already employed as an Assistant Lecturer at the University College of North Staffordshire, now the University of Keele. He held this position from 1957 to 1960 when he moved back to Manchester as a Lecturer in the Faculty of Technology. The Pure Mathematics Department in the Faculty of Technology was led by Hanna Neumann and Wiegold had already started joint work with her on certain products of groups which they called linked products before he joined the staff at Manchester. Their joint paper Linked products and linked embeddings of groups appeared in 1960. In 1963 Wiegold left Manchester and returned to Wales when he was appointed as a Lecturer at the University College of South Wales and Monmouthshire, now Cardiff University. He returned with his young family to Wales, in order to be closer to his now-widowed father and siblings, rather than because of any pro-Welsh drive.
In 1966 Wiegold was promoted to Senior Lecturer. Then in 1968 he went to the School of General Studies of the Australian National University where he spent two years, first as a Visiting Senior Lecturer and in the second year as a Visiting Reader. Both Bernhard and Hanna Neumann had left Manchester in the same year that Wiegold went to Cardiff. When Wiegold visited, Hanna Neumann held the chair of pure mathematics in the School of General Studies and Bernhard Neumann was Head of the Mathematics Department at the Institute of Advanced Studies. Wiegold's youngest sister Liz went out to Australia with Jim and his family, and remained at ANU as a history student after they left. Liz married Daniel Neumann, the youngest of Bernhard and Hanna Neumann's children. Wiegold was promoted to a Readership at Cardiff in 1969. In  John Lennox recalls an interesting aspect of this promotion:-
Jim was amused by the fact that I got to know about his Readership before he did! One day, towards the end of my own PhD research, Philip Hall told me that there was a certain James Wiegold who was about to get a Readership at Cardiff. Hall suggested I should apply for a lectureship in Cardiff, remarking: "Jim is an excellent man and I think you two will get on very well." He could not have been more prophetic - Jim and I were subsequently involved in writing 26 joint papers. I thus got my first post as a result of Jim's ability - typical of the man, helping others without even knowing it.In 1974 Wiegold became a professor when given a personal chair in the University College, Cardiff. From 1982 to 1985 he served as Dean of Science.
We have already indicated the contents of Wiegold's thesis, the main results of which he published in 1959. This was not his first paper, however, for he had already published Groups with boundedly finite classes of conjugate elements in the Proceeding of the Royal Society of London in 1957. In 1960, in addition to the paper with Hanna Neumann mentioned above and a short paper On a note of B H Neumann, Wiegold published two further papers On direct factors in groups and Some remarks on generalised products of groups with amalgamations. In the first of these two papers he proved that a group G has the property that every normal subgroup is a direct factor if and only if G is a restricted direct product of simple groups, while the second paper extended the results of his earlier paper Nilpotent products of groups with amalgamations. In 1962 he published two papers on embeddings, namely Embedding group amalgams in wreath products and (with Bernhard Neumann) On certain embeddability criteria for group amalgams.
The range and quantity of Wiegold's mathematics make it impossible to give here anything other than an impression of the many areas on which Wiegold worked and the remarkable range of his co-authors. We shall, however, indicate two topics which were important to Wiegold and on which he devoted continued effort over many years. The first is the theory of the Schur multiplicator (or multiplier): his papers on this topic include Multiplicators and groups with finite central factor-groups (1965), The multiplicator of a direct product (1971), Some groups with non-trivial multiplicators (1971), (with Michael Jones) A subgroup theorem for multipliers (1973), and (with Michael Jones) Isoclinisms and covering groups (1974). In 1981 Wiegold gave a five-lecture survey entitled The Schur multiplier: an elementary approach at the first Groups St Andrews conference. In his introduction, he said:-
The aim is to take a little corner of the study of multipliers, namely the specifically 'group-theoretic' corner, and talk about that in as self-contained a manner as possible.The article Wiegold wrote for the conference Proceedings based on these lectures is today the most cited of all his 127 papers. Having mentioned Wiegold's most cited paper, let us note that his second most cited paper is Groups with all subgroups normal-by-finite (1995) which he wrote jointly with John Lennox, Bernhard Neumann and Howard Smith.
We promised to mention two topics that were particularly important to Wiegold: the second is growth sequences. If d(Gn) denotes the minimum number of generators of the nth power of a group G, then growth sequences study the asymptotic behaviour of the sequence (d(Gn)). Between 1974 and 1980 he published four articles entitled Growth sequences of finite groups, all in the Journal of the Australian Mathematical Society. In 1978, jointly with John S Wilson, he published Growth sequences of finitely generated groups and, in 1989, a second part appeared written jointly by Wiegold and Alastair G R Stewart. In 1990, at the 21st Annual Iranian Mathematics Conference held in Isfahan, he gave a survey entitled Growth sequences.
Wiegold's papers are a joy to read. He had a wonderful feel for the important questions in his subject and he initiated research into a great variety of areas which are active today. His papers are highly readable, simply and honestly written with a clarity that brings out the significant ideas. Also his papers are rich in conjectures and unsolved problems. Let us illustrate this by quoting from his 1981 survey on the Schur multiplier (missing out technical statements of the problems and his comments on what is already known):-
Here is a fantastically difficult problem. [Problem 5.3] ... although I like Problem 5.3, I think it will be a long time before anything happens to it. In this area, problems are easy to invent. ...Before leaving our discussion of Wiegold's research, we mention the importance he put on checking the correctness of any results from papers by other authors which he had used in the proof of his own theorems. Whenever he used a result he felt bound to check the proof of that result so as to ensure its correctness as well as the correctness of his own arguments.
Perhaps the most persistent problem is [Problem 6.1]. ... we do not know the answer to [Problem 6.2] ... One might have more luck with [Problem 6.3]. Kite-flying, I know: but I guess that something more about the elusive multiplier will be discovered if it is tackled.
A major contribution by Wiegold came from his editorial appointments which included being a Member of the Editorial Board of the London Mathematical Society (1973-74), Secretary of the Journal of the London Mathematical Society (1974-77), and Joint Editor in Chief (with Desmond Evans) of the Proceedings of the London Mathematical Society (1986-1992). He translated many articles and books from Russian into English, and this led to him serving as Assistant Editor of Sbornik Mathematics starting in 1994. He also held important posts in the administration of UK mathematics, for example as a Member of the Mathematical Sciences Subcommittee of the University Grants Committee (1981-86) and Chairman of the British Mathematical Olympiad Committee 1997-98.
Wiegold spent research visits of up to three months at the Institute of Advanced Studies, Australian National University (1965), Adelaide (1973), Aachen (1978), York University, Toronto (1979), Western Michigan (1982), Manitoba (1982), York University, Toronto (1982), Padova (1986), Aachen (1986), and Napoli (1988). He was a plenary speaker at many conferences including 'Groups St Andrews 1981' in St Andrews, Scotland (1981), Botswana (1981), 'Group theory' in Bressanone, Italy (1989), 'Groups - Canberra 1989' at A.N.U. Canberra (1989), Trento, Italy (1992), Western Michigan (1992), 'Infinite groups 1994' in Ravello, Italy (1994), and 'Groups Galway' in Galway, Ireland (1995). He also was a colloquium speaker at universities in Britain, Ireland, Germany, Canada, USA, India, Australia and Zimbabwe.
Let us end this biography with some quotes from those who knew him best. Joe Buckley writes :-
Jim was the best colleague I ever had. The time of collaboration with him was the most satisfying period in my professional life ... he was the most generous mathematician I ever met. He didn,t guard his maths problems. He enjoyed sharing them with others.His daughter, Alison Sharrock, writes :-
Inside the successful mathematician there was always a linguist struggling to get out. It was a particular delight to him when the two interests met, both in his translating of Russian mathematical articles into English and also in the publication of mathematical work in Welsh. He was equally fascinated by English, considering Middle English the most beautiful language ever and wishing he had time to master Anglo-Saxon. One of his longest standing interests was in place names; the Oxford Dictionary of English Place Names acquired a near-mystical significance for him.John Lennox writes:-
Jim had a sharp wit but was never unkind. He also had a tremendous sense of humour. ... [He] was an interesting man because he was interested in virtually everything, and we all loved his conversation. I can see him now, walking down Senghenydd Road, talking animatedly and every so often pausing to uproot a buddleia plant, muttering under his breath that he was saving the Cardiff council money by preventing the cracking of pavements and walls. He had an infectious sense of wonder at creation and was fascinated by all aspects of learning, science, literature, language and music. I vividly recall watching him give an amazing performance of Gilbert and Sullivan that one would have thought challenging to one of Jim's athletic build. He was equally at home singing regularly in the church choir.Finally we quote from Jeff Griffiths who writes about Wiegold's love of mathematics at all levels :-
Probably Jim's fondest activity was running the Maths Club for local school children with John Rigby - a task which he enthusiastically continued right up to the last few months of his life. Indeed, when I visited him at the hospice a few days before his passing, his last words to me (even though he was desperately ill) was that he needed to get home so he could prepare the Maths Problem Sheet for the next meeting of the Club in October. The school pupils who attended the Maths Club absolutely adored him.
Article by: J J O'Connor and E F Robertson