What type of details about john m. lipski can be gathered from the following bio? Bio: john m. lipski is an american linguist who is most widely known for his work on spanish and portuguese dialectology and language variation . his research also focuses on spanish phonology , the linguistic aspects of bilingualism and code-switching , african influences on spanish and portuguese , and pidgin and creole studies . he is currently the edwin erle sparks professor of spanish linguistics in the department of spanish , italian , and portuguese at the pennsylvania state university . he previously served as the head of the same department from 2001 to 2005 .
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