I'm not too sure about his work relating to Sahaba Ikram (RadiAllahuAnhum) but his biography of Sayyiduna Salahuddin is very well researched, its been translated into English also in 4 volumes.
http://www.amazon.com/Al-Hasan-ibn-Ali-Abi-Talib/dp/6035012132 Has anybody read the works of this author Ali. M Sallabi, as he has many works on the Ashaab Alayhimur Ridwaan. Are his works authentic? http://www.amazon.com/Umar-Ibn-Al-k...6-7423457?ie=UTF8&refRID=01E6PHWHW0RNEY0C55RV Jazaak Allah