Abdul Qadeer Khan (Urdu: ڈاکٹر عبد القدیر خان ; born: 1 April 1936), D.Eng, Sc.D, HI, NI (twice), FPAS; more widely known as Dr. A. Q. Khan, is a Pakistani nuclear scientist and a metallurgical engineer who served as the Director-General of the Kahuta Research Laboratories (KRL) from 1976 until 2001. Abdul Qadeer Khan is widely regarded as the founder of HEU based Gas-centrifuge uranium enrichment programme for Pakistan's nuclear deterrence development.
Abdul Qadeer Khan was one of Pakistan's top scientists, and was involved in the country's various scientific programmes until his debriefing. On January 2004, Khan was officially summoned for a debriefing on his suspicious activities in other countries after the United States provided evidences to the Pakistan Government, and confessed it a month later. After years of debriefing, the Islamabad High Court (IHC) on 6 February 2009 declared Abdul Qadeer Khan to be a free citizen of Pakistan, allowing him free movement inside the country. The verdict was rendered by Chief Justice Sardar Muhammad Aslam. In September 2009, expressing concerns over the Lahore High Court’s decision to end all security restrictions on Khan, the United States warned that Khan still remains a "serious proliferation risk".
Khan was born in 1936 to a Pashtun family in Bhopal State of India (then part of the British Indian Empire). His father Dr. Abdul Ghafoor Khan was an academic who served in the Education Ministry of the British Indian Government and after retirement in 1935, he settled permanently in Bhopal State. In 1947, after the partition, the family migrated from India to Pakistan, and settled in West-Pakistan. Khan studied in Saint Anthony's High School of Lahore, and then enrolled at the D.J. Science College of Karachi. There, he took B.Sc. in Physics and B.A. in Mathematics under the supervision of Suparco physicist Dr. Bashir Syed. In 1956, he attended Karachi University and obtained a B.S. degree in Metallurgy in 1960. To support the fees of his education, Khan was employed at Siemens Engineering where he worked as a practical trainee (junior engineer).