Fazlur Rahman Khan, also known as named as "The Father of tubular designs for high-rises",[1] was highlighted by President Barack Obama in a 2009 speech in Cairo, Egypt,[2] and has been called "Einstein of Structural engineering".[3] Min Chueh Chang was the co-inventor of the combined oral contraceptive pill and contributed significantly to the development of in vitro fertilisation at the Worcester Foundation for Experimental Biology.Chinese immigrants Tsung-Dao Lee and Chen Ning Yang received the 1957 Nobel Prize in Physics for theoretical work demonstrating that the conservation of parity did not always hold and became American citizens in the early 1960s.In 2008, biochemist Roger Tsien won the Nobel in Chemistry for his work on engineering and improving the green fluorescent protein (GFP) that has become a standard tool of modern molecular biology and biochemistry.While working for the University of New Hampshire as a lecturer, Zhang submitted an article to the Annals of Mathematics in 2013 which established the first finite bound on gaps between prime numbers, which led to a 2014 MacArthur award.In 1984, Dr. David D. Ho first reported the "healthy carrier state" of HIV infection, which identified HIV-positive individuals who showed no physical signs of AIDS.