I think the article ought to record how long PL was a member of the IPA – I imagine his membership must have been very long. I think the bit about his being "involved in maintaining its International Phonetic Alphabet" ought to make a mention of the importance of his contribution to the 1989 Kiel Conference - in fact, the Wikipedia article on the Kiel Conference itself makes no mention of him beyond listing various related publications of his. The article should also record that he was President of the IPA – I believe that was from 1986 to 1991. And I must say I have no recollection of him ever having been editor of JIPA.
I’d be glad if anyone could give me the relevant facts. I’ll be happy to make the necessary corrections.