He actively participated in the Sudanese Medical Association and played a role in the popular October 1964 Revolution, advocating for political change in Sudan.

[3] He completed a Diploma from Kitchener School of Medicine in 1934 and then worked in Omdurman, Khartoum, Juba, Yei, Sinja, Sennar, Ad-Damazin, Gedaref and El-Obeid.

[citation needed] Shaddad worked in the Omdurman Teaching Hospital 1961-1964 where he became a senior specialist in obstetrics and gynaecology, and then a director.

[5][6]Shaddad was among the representatives of the Doctors Syndicate during the popular October 1964 Revolution, standing at the forefront of the movement that led to significant political changes in Sudan.

[9][10] Following from the removal of Abboud, he assumed roles in the Second Sudanese Sovereignty Council, serving as a member and later as a rotating president from 3 December 1964–10 June 1965.