Project Gutenberg's Devotions Upon Emergent Occasions, by John Donne - the introduction to this book is a detailed description of John Donne's life, and the difficulties he faced in finding employment, with recurrent ill health, and in looking after his family. It also details the importance of his faith and eventual appointment to the Church.
Detailed biography of John Donne via Britannica. This article gives a solid description of Donne's upbringing, career, prose and poetry. The section on his poetry explores the range of techniques employed in Donne's poetry
Metaphysical Poet - article in Britannica detailing the characteristic techniques and themes of the Metaphysical poets.
John Donne Useful discussion of John Donne's background, influences upon his life, development as a poet. Includes observations onhow Donne's poetry changed over time, possibly as a refection of changing circumstances and situations in life.