Question: What was the profession of the man with the initials A.S. that was portrayed on the BBC documentary Nuremberg: Nazis on Trial?

Context articles: Nuremberg Diary
Nuremberg: The Nazis Facing their Crimes
Robin Hood (1953 TV series)
The Nazis: A Warning from History
High Command Trial
Pohl trial
Katzenberger Trial
Judges' Trial
Nuremberg: Nazis on Trial
Albert Speer

Nuremberg Diary (ISBN  ) is Gustave Gilbert's account of and interviews he conducted during the Nuremberg Trials of Nazi leaders, including Hermann Göring, involved in World War II and the Holocaust.
 Dr. Gilbert, a fluent German speaker, served as a prison psychologist in Nuremberg, where he had close contact with those on trial.
 The text is the verbatim notes Gilbert took immediately after having conversations with the prisoners, information backed up by essays he asked them to write about themselves.
 The diary was first published in 1947 and reissued in 1961, just before the trial of Adolf Eichmann in Jerusalem.
Nuremberg: The Nazis Facing their Crimes (French title: Nuremberg - Les nazis face à leurs crimes) is a 2006 documentary about the Nuremberg Trials made by French historian and director and coproduced by and ARTE France.
 The English version, narrated by Christopher Plummer, premiered at the Lincoln Center in 2007.
Robin Hood is a six-episode television series starring Patrick Troughton as Robin Hood and Wensley Pithey as Friar Tuck.
 It was written by Max Kester, and produced and directed by Joy Harington for the BBC.
 The 30 minute episodes were transmitted live, and only eight minutes from the second episode, "The Abbot of St. Mary's", exists (as a 16mm telerecording).
 Short clips of this material appeared in 2007 documentary, presented by Jonathan Ross, covering Robin Hood from its beginnings to the more recent BBC production (2006), and were also shown as an example of television production in the BBC documentary series "Children's T.V. On Trial The 1950s".
The Nazis: A Warning from History is a 1997 BBC documentary film series that examines Adolf Hitler and the Nazis' rise to power, their zenith, their decline and fall, and the consequences of their reign.
 It featured archive footage and interviews with eyewitnesses and was shown in six episodes.
The High Command Trial (officially, The United States of America vs. Wilhelm von Leeb, et al.), also known initially as Case No. 12 (the 13 Generals' trial), and later as Case No. 72 (the German high command trial: Trial of Wilhelm von Leeb and thirteen others), was the last of the twelve trials for war crimes the U.S. authorities held in their occupation zone of Germany in Nuremberg after the end of World War II.
 These twelve trials were all held before U.S. military courts, not before the International Military Tribunal, but took place in the same rooms at the Palace of Justice.
 The twelve U.S. trials are collectively known as the "Subsequent Nuremberg Trials" or, more formally, as the "Trials of War Criminals before the Nuremberg Military Tribunals" (NMT).
The Pohl trial against the Nazi German administration of the "Final Solution" (also known as the WVHA Trial and officially "The United States of America vs. Oswald Pohl, et al") was the fourth of the twelve trials for war crimes that the United States authorities held in their occupation zone in Germany in Nuremberg after the end of World War II.
 The twelve trials were all held before U.S. military courts, not before the International Military Tribunal, although both courts presided in the same rooms at the Palace of Justice.
 They are known collectively as the "Subsequent Nuremberg Trials" or more formally, as the "Trials of War Criminals before the Nuremberg Military Tribunals" (NMT).
The Katzenberger Trial was a notorious Nazi show trial.
 A Jewish businessman and leading member of the Nuremberg Jewish community, Lehmann (Leo) Katzenberger, was accused of having an affair with a young "Aryan" woman, and on 14 March 1942 was sentenced to death.
 The presiding judge at the trial, Oswald Rothaug, was later tried at the Nuremberg Trials (see Judges' Trial) and sentenced to life imprisonment.
 The Katzenberger Trial later formed the basis of a subplot in the 1961 film "Judgment at Nuremberg".
The Judges' Trial (German: "Juristenprozess" ; or, the Justice Trial, or, officially, The United States of America vs. Josef Altstötter, et al.) was the third of the 12 trials for war crimes the U.S. authorities held in their occupation zone in Germany in Nuremberg after the end of World War II.
 These twelve trials were all held before U.S. military courts, not before the International Military Tribunal, but took place in the same rooms at the Palace of Justice.
 The twelve U.S. trials are collectively known as the "Subsequent Nuremberg Trials" or, more formally, as the "Trials of War Criminals before the Nuremberg Military Tribunals" (NMT).
Nuremberg: Nazis on Trial, is a BBC documentary film series consisting of three one-hour films that re-enact the Nuremberg War Trials of Albert Speer, Hermann Göring, and Rudolf Hess.
 They were broadcast on BBC Two in 2006 to coincide with the 60th anniversary of the trials.
 In 2015, American Heroes Channel aired the film under an alternate title, "Nuremberg: Nazi Judgement Day".
Berthold Konrad Hermann Albert Speer ( ; ] ; March 19, 1905 – September 1, 1981) was a German architect who was, for most of World War II, Reich Minister of Armaments and War Production for Nazi Germany.
 Speer was Adolf Hitler's chief architect before assuming ministerial office.
 As "the Nazi who said sorry", he accepted moral responsibility at the Nuremberg trials and in his memoirs for complicity in crimes of the Nazi regime, while insisting he had been ignorant of the Holocaust.