Question: Who is older William Daniel Phillips or Steven Chu ?

Context paragraphs:
Ju-Chin Chu: Ju-Chin Chu (; December 14, 1919 – November 15, 2000) was a Chinese American chemical engineer and father of Steven Chu.  He was born in Taicang, Jiangsu, China.  Chu attended Suzhou High School, Tsinghua University and National Southwestern Associated University in China before he went to Massachusetts Institute of Technology for Ph.D. education in 1946.  After graduating from MIT, he taught at Washington University in St. Louis from 1946 to 1949, at Brooklyn Polytechnic Institute from 1949 to 1966, and at Virginia Tech from 1967 to 1972.  He became a Academia Sinica member in 1964.

Joel Daniel Phillips: Joel Daniel Phillips is an American artist best known for his realist life-size portraits of San Francisco residents, notably disenfranchised segments of the population.  He works primarily with charcoal and graphite.  Phillips' drawings depict figures isolated on the page with no anchors to space.  Phillips' work has been displayed around the globe and is currently represented by Hashimoto Contemporary in San Francisco, California and Galleri Ramfjord in Oslo, Norway.

Shu-tian Li: Shu-tian Li (Shu-tien Li; ) (1900–1988) was a citizen of the United States, a Chinese American educator and engineer.  His brother, Shu-hua Li or Li Shu-hua (李书华 ) was a physicist and a former Secretary of Education in China, and contributed to the founding of UNESCO.  Li was the maternal grandfather of Steven Chu, a Nobel Prize winner in physics and the USA Secretary of Energy in the Obama Administration and Morgan Chu, an intellectual property lawyer.  After receiving a Ph.D. degree in engineering/economics from Cornell University in 1926, Li returned to China to assume a professorship at the Peiyang University.  He became the executive officer of Northern China Hydraulic Commission in 1928.  He was a founder of the Chinese Hydraulic Engineering Society and served as its deputy president and then president for six terms.  Later he was appointed to lead the Yellow River Commission.

Croatan Sound: Croatan Sound is an inlet in Dare County, North Carolina.  It connects Pamlico Sound with Albemarle Sound, and is bordered to the east by Roanoke Island; Roanoke Sound is on the other side of the island.  Its name comes from the Croatan Indians who once inhabited the area.  The Croatan Sound is crossed by two bridges, the older William B. Umstead Bridge, and the newer Virginia Dare Memorial Bridge, which carries U.S. Route 64.

William Daniel Phillips: William Daniel Phillips (born November 5, 1948) is an American physicist.  He shared the Nobel Prize in Physics, in 1997, with Steven Chu and Claude Cohen-Tannoudji.

Steven Chu: Steven Chu (, born February 28, 1948) is an American physicist.  He is known for his research at Bell Labs and Stanford University regarding the cooling and trapping of atoms with laser light, for which he won the Nobel Prize in Physics in 1997, along with his scientific colleagues Claude Cohen-Tannoudji and William Daniel Phillips.

Orion String Quartet: The Orion String Quartet is a string quartet formed in 1987.  It is the quartet-in-residence of The Chamber Music Society of Lincoln Center and New York's Mannes College The New School for Music.  The members are Todd and Daniel Phillips, brothers who alternate on first and second violin, violist Steven Tenenbom and cellist Timothy Eddy.  Members of the quartet teach at the Curtis Institute of Music, Mannes, Juilliard, Queens College, and the Bard College Conservatory of Music.

William Pilch (cricketer, born 1820): William Pilch (18 June 1820 – 11 January 1882) was an English cricketer who played first-class cricket for Kent County Cricket Club, the Players, teams calling themselves "England" and other teams in a professional cricket career that extended from 1840 to 1857.  He was a member of a famous cricketing family: his father was Nathaniel Pilch, and the great Fuller Pilch and an older William Pilch were his uncles.  He was born at Brinton, Norfolk and died at Canterbury, Kent.

Claude Cohen-Tannoudji: Claude Cohen-Tannoudji (born 1 April 1933) is a French physicist.  He shared the 1997 Nobel Prize in Physics with Steven Chu and William Daniel Phillips for research in methods of laser cooling and trapping atoms.  He is still an active researcher, working at the École Normale Supérieure in Paris.

Daniel Poneman: Daniel Bruce Poneman (born March 12, 1956) is an American politician who was the United States Deputy Secretary of Energy from 2009 to 2014 and is currently a Distinguished Fellow at the Paulson Institute at the University of Chicago.  Poneman was Acting Secretary of Energy in 2013 following the resignation of Steven Chu until Ernest Moniz was confirmed and sworn in.

Supporting paragraphs: William Daniel Phillips Steven Chu
Answer: Steven Chu