Asalamualaykum Shaykh , i have been given a task at my college to write a book review on the biography of imam ahmad by salah din mawjood, and on wikipedia i read he was a scholar who studied from muqbil b haadi and i wrote in my reviee that he was probably from creed of salaf, Any advice regarding

Ustadh AbdulAziz al-Haqqan

I do not know him.