Leon Takhtajan
Leon Armenovich Takhtajan (born 1 October 1950, Yerevan) is a Russian mathematical physicist of Armenian descent, currently a professor of mathematics at the Stony Brook University, Stony Brook, NY, and a leading researcher at the Euler International Mathematical Institute, Saint Petersburg, Russia.
Takhtajan, son of the Armenian Soviet botanist Armen Takhtajan, received in 1975 his Ph.D. (Russian candidate degree) from the Steklov Institute under Ludvig Faddeev with thesis "Complete Integrability of the Equation formula_1".
He was then employed at the Steklov Institute and in 1982 received his D.S. degree (doctor of science, 2nd degree in Russia) with thesis "Completely integrable models of field theory and statistical mechanics".
Since 1992 he is professor at Stony Brook University and was the chair of the mathematics department in 2009–2013.
His research is on integrable systems of mathematical physics (such as the theory of solitons) and applications of quantum field theories and models of string theory to algebraic geometry and complex analysis and includes quantum field theories on algebraic curves and associated reciprocity laws, two-dimensional quantum gravity and Weil–Petersson geometry of moduli spaces, the Kähler geometry of universal Teichmüller space, and trace formulas.
His major contributions are in theory of classical and quantum integrable systems, quantum groups and Weil–Petersson geometry of moduli spaces.
Together with Ludvig Faddeev and Evgeny Sklyanin he formulated the algebraic Bethe Ansatz and quantum inverse scattering method.
Together with Ludvig Faddeev and Nicolai Reshetikhin he proposed a method of quantization of Lie groups and algebras, the FRT construction.
In 1983 he was an invited speaker at the International Congress of Mathematicians in Warsaw and gave a talk "Integrable models in classical and quantum field theory".
Etan Boritzer
Etan Boritzer( born 1950) is an American writer of children ’s literature who is best known for his book" What is God?" first published in 1989.
His best selling" What is?" illustrated children's book series on character education and difficult subjects for children is a popular teaching guide for parents, teachers and child- life professionals.
Boritzer gained national critical acclaim after" What is God?" was published in 1989 although the book has caused controversy from religious fundamentalists for its universalist views.
The other current books in the" What is?" series include
What is Love?,
What is Death?,
What is Beautiful?,
What is Funny?,
What is Right?,
What is Peace?,
What is Money?,
What is Dreaming?,
What is a Friend?,
What is True?,
What is a Family?,
What is a Feeling?"
The series is now also translated into 15 languages.
Boritzer was first published in 1963 at the age of 13 when he wrote an essay in his English class at Wade Junior High School in the Bronx, New York on the assassination of John F. Kennedy.
His essay was included in a special anthology by New York City public school children compiled and published by the New York City Department of Education.
Boritzer now lives in Venice, California and maintains his publishing office there also.
He has helped numerous other authors to get published through" How to Get Your Book Published!" programs.
Boritzer is also a yoga teacher who teaches regular classes locally and guest- teaches nationally.
He is also recognized nationally as an erudite speaker on" The Teachings of the Buddha."
Fred Bradley (rower)
Frederick Bradley( 1908- date of death unknown) was an English rower.
Albert Thompson (footballer, born 1912)
Albert Thompson( born 1912, date of death unknown) was a Welsh footballer.
Thomas Scott (diver)
Thomas Scott( 1907- date of death unknown) was an English diver.
Bill Smith (footballer, born 1897)
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Harry Johnson (wrestler)
Harry Johnson( 1903- date of death unknown) was an English wrestler.
Theodred II (Bishop of Elmham)
Theodred II was a medieval Bishop of Elmham.
The date of Theodred's consecration unknown, but the date of his death was sometime between 995 and 997.
Armen Takhtajan
Armen Leonovich Takhtajan or Takhtajian
(surname also transliterated Takhtadjan, Takhtadzhi︠a︡n or Takhtadzhian, pronounced TAHK-tuh-jahn)
(June 10, 1910 – November 13, 2009), was a Soviet-Armenian botanist, one of the most important figures in 20th century plant evolution and systematics and biogeography.
His other interests included morphology of flowering plants, paleobotany, and the flora of the Caucasus.
He was born in Shusha.
He was one of the most influential taxonomists of the latter twentieth century.
Harry Wainwright (footballer)
Harry Wainwright( born 1899; date of death unknown) was an English footballer.

Question: When did Leon Takhtajan's father die?
Answer: November 13, 2009