The great doctor, D. Martyn Lloyd-Jones was pastor of Westminster Chapel in London, not far from Buckingham Palace. Known for his preaching abilities, the Lord used him to convict hearers as he instructed them in their relationship with God through Christ by expounding upon the Holy Scriptures.
Best known for his commentaries, especially that on Romans and Ephesians, many would benefit from reading his thoughts on the Sermon on the Mount. For pastors, their time will not be wasted in reading Preachers and Preaching.
I would also recommend Iain Murray’s biography, The Life of Martyn Lloyd-Jones.