John Milton (Paradise Lost) holds the record in the Oxford English Dictionary for the most neologisms.
Milton is responsible for introducing some 630 words to the English language, making him the country's greatest neologist, ahead of Ben Jonson with 558, John Donne with 342 and Shakespeare with 229. Without the great poet there would be no liturgical, debauchery, besottedly, unhealthily, padlock, dismissive, terrific, embellishing, fragrance, didactic or love-lorn. And certainly no complacency.
If he were alive today, what with him being a poet and mastery at inventing new words, I bet John Milton or J'Millionaire would be a sick free style lyricist.
[Via]