Question: The person who wrote the biography of Bertha of Bingen was born in what year?

Context articles: Disibodenberg
Bertha of Bingen
Annalyn Swan
Bertha Vyver
Hildegard of Bingen
Jonny Steinberg
Jakob Karl Ernst Halm
Deborah Baker
Beverly Mayne Kienzle
The Story of a Great Schoolmaster

Disibodenberg is a monastery ruin in Rhineland-Palatinate, Germany.
 It was founded by Saint Disibod.
 Hildegard of Bingen, who wrote Disibod's biography "Vita Sancti Disibodi", lived in Disibodenberg for 39 years.
Saint Bertha of Bingen (German: "Heilige Berta", died ca. 757) was the mother of Rupert of Bingen.
 Her biography was written, and subsequently her cult popularized, by Hildegard of Bingen, who lived in the same region, about three hundred years later.
 Bertha and Rupert share a feast day on May 15.
Annalyn Swan (born ca. 1951 in Biloxi, Mississippi) is an American writer and biographer who has written extensively about the arts.
 With her husband, art critic Mark Stevens she is the author of "" (2004), a biography of Dutch-American artist Willem de Kooning, which was awarded the 2005 Pulitzer Prize for Biography or Autobiography.
 De Kooning also won the National Book Critics Circle prize for biography and the Los Angeles Times biography award, and was named one of the 10 best books of 2005 by the New York Times.
 In her review in the New York Times, Janet Maslin wrote: "The elusiveness of its subject makes the achievements of de Kooning: An American Master that much more dazzling."
Bertha Vyver (11 June 1854 – 20 November 1941) was a caretaker for Scottish poet Charles Mackay and the companion of Marie Corelli.
 From 1875 until his death in 1889, Vyver kept house and nursed Mackay, later caring for her own mother prior to her death.
 Relieved of her nursing duties, Vyver remained with Corelli encouraging and facilitating her writing career.
 When Corelli died, Vyver became executor of her literary estate and wrote a biography of the author.
Hildegard of Bingen, O.S.B. (German: "Hildegard von Bingen" ; ; 1098 – 17 September 1179), also known as Saint Hildegard and Sibyl of the Rhine, was a German Benedictine abbess, writer, composer, philosopher, Christian mystic, visionary, and polymath.
 She is considered to be the founder of scientific natural history in Germany.
Jonny Steinberg is a South African writer and scholar.
 He is the author of several books about everyday life in the wake of South Africa’s transition to democracy.
 Two of them, "Midlands" (2002), about the murder of a white South African farmer, and "The Number" (2004), a biography of a prison gangster, won South Africa’s premier non-fiction award, the "Sunday Times" Alan Paton Award.
 In 2013, he was among the inaugural winners of the Windham-Campbell Literature Prizes, awarded by Yale University.
 Steinberg’s books also include "Three-Letter Plague" ("Sizwe’s Test" in the United States), which chronicles a young man’s journey through South Africa’s AIDS pandemic.
 It was a "Washington Post" Book of the Year and was shortlisted for the Wellcome Trust Book Prize, among others.
 Steinberg is also the author of "Thin Blue" (2008), an exploration of the unwritten rules of engagement between South African civilians and police, and "Little Liberia: An African Odyssey in New York" (2011), about the Liberian civil war and its aftermath in an exile community in New York and described as an "extraordinary, stylistically varied mix of reportage, history and biography".
 Steinberg's 2015 book, "A Man of Good Hope", was described as "superb" by "Observer" reviewer Ian Birrell, who wrote: "On the surface, it is simply the biography of a lonely young migrant who dreams of a decent life, hardening his shell and hustling to survive in hostile human environments.
 Yet it is really an epic African saga that chronicles some fundamental modern issues such as crime, human trafficking, migration, poverty and xenophobia, while giving glimpses into the Somali clan system, repression in Ethiopia and lethal racism in townships."
Jakob Karl Ernst Halm (born Bingen am Rhein: 30 November 1866 – South Africa 17 July 1944) was a pioneer of stellar dynamics and the first person to suggest the existence of a mass-luminosity relation for stars.
Deborah Baker is a biographer and essayist.
 She is married to the writer Amitav Ghosh and lives in Brooklyn, Calcutta, and Goa.
 She is the author of "A Blue Hand: The Beats in India", a biography of Allen Ginsberg that focuses on his time in India and of "In Extremis: The Life of Laura Riding", a finalist for the Pulitzer Prize in biography in 1994.
 She also writes for the "Los Angeles Times".
 Her book "The Convert: A Tale of Exile and Extremism" (2011) is a biography of Maryam Jameelah (born Margaret Marcus), a Jewish woman from New York who converted to Islam.
 In 2012, she wrote a critical review for the "Wall Street Journal" of "Defender of the Realm", the Manchester-Reid biography of Winston Churchill.
Beverly Mayne Kienzle (born 1947) retired in 2015 as the John H. Morison Professor of the Practice in Latin and Romance Languages at the Harvard Divinity School, Harvard University.
 She is a specialist in Christian Latin, Latin paleography, and medieval Christianity.
 She has published over seventy articles and fifteen books, including five on Hildegard of Bingen.
 Her latest book is an authoritative biography of her grandmother, Virginia Cary Hudson, author of the best-selling "O Ye Jigs and Juleps!"
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The Story of a Great Schoolmaster is a 1924 biography of Frederick William Sanderson (1857-1922) by H. G. Wells.
 It is the only biography Wells wrote.
 Sanderson was a personal friend, having met Wells in 1914 when his sons George Philip ('Gip'), born in 1901, and Frank Richard, born in 1903, became pupils at Oundle School, of which Sanderson was headmaster from 1892 to 1922.
 After Sanderson died while giving a lecture at University College London at which he was introduced by Wells, the famous author agreed to help produce a biography to raise money for the school.
 But in December 1922, after disagreements emerged with Sanderson's widow about his approach to the subject, Wells withdrew from the official biography (published in 1923 as "Sanderson of Oundle"; Wells wrote much of the text but the volume was published without listing an author) and published his own work separately.