There are many excellent works on the life and person of the Prophet (Allah bless him and give him peace) in English.
I would recommend the following:
1. Martin Lings’ Muhammad: His Life Based on the Earliest Sources (link)
2. Dr. Bouti’s Fiqh al-Sira (Lessons from the Life of the Prophet) – published as Jurisprudence of the Biography of the Prophet Muhammad (link)
3. Shaykh Abdullah Sirajuddin’s Our Master Muhammad, the Messenger of Allah (peace and blessings be upon him) – two volumes. (link)
4. Shaykh Hamza Yusuf’s CD set The Life of the Prophet (Allah bless him and give him peace)
And Allah alone gives success.
Shaykh Asif of Halal or Haram Team