Question: Ulrich Walter and Mirosław Hermaszewski were both astronauts, which one was also a german physicist and engineer?

full_context: Document 1: Ulrich Walter: Prof. Dr. Ulrich Hans Walter (born February 9, 1954) is a German physicist/engineer and a former DFVLR astronaut.
Document 2: Soyuz TM-3: Soyuz TM-3 was the third manned spacecraft to visit the Soviet space station Mir, following Soyuz-T15 and Soyuz-TM2. It was launched in July 1987, during the long duration expedition Mir EO-2, and acted as a lifeboat for the second segment of that expedition. There were three people aboard the spacecraft at launch, including the two man crew of the week-long mission Mir EP-1, consisting of Soviet cosmonaut Alexander Viktorenko and Syrian Muhammed Faris. Faris was the first Syrian to travel to space, and as of November 2010, the only one. The third cosmonaut launched was Aleksandr Aleksandrov, who would replace one of the long duration crew members Aleksandr Laveykin of Mir EO-2. Laveykin had been diagnosed by ground-based doctors to have minor heart problems, so he returned to Earth with the EP-1 crew in Soyuz TM-2.
Document 3: Reinhard Furrer: Prof. Dr. Reinhard Alfred Furrer (25 November 1940 – 9 September 1995) was a German physicist and astronaut.
Document 4: Mirosław Hermaszewski: Mirosław Hermaszewski (born September 15, 1941) is a retired Polish Air Force officer and cosmonaut. He became the first (and to this day remains the only) Polish national in space, when he flew aboard the Soviet Soyuz 30 spacecraft in 1978.
Document 5: Wubbo Ockels: Wubbo Johannes Ockels (28 March 1946 – 18 May 2014) was a Dutch physicist and an astronaut of the European Space Agency (ESA). In 1985 he participated in a flight on the space shuttle Challenger, STS-61-A, making him the first Dutch citizen in space. After his astronaut career, Ockels was professor of "Aerospace for Sustainable Engineering and Technology" at the Delft University of Technology.
Document 6: Ulf Merbold: Dr. Ulf Dietrich Merbold (born June 20, 1941) is the first West German citizen and second German native (after Sigmund Jähn) to have flown in space. He is also the first member of the European Space Agency Astronaut Corps to participate in a spaceflight mission and the first non-US citizen to reach orbit in a US spacecraft. In 1983, he and Byron Lichtenberg became the first Payload Specialists to fly on the shuttle.
Document 7: Walter Dröscher: Walter Dröscher is a physicist who worked at the Austrian Patent office (Österreichisches Patentamt) . Now in retirement, he devotes most of his time to developing Heim Theory. It was in 1980 that Dröscher was introduced to the reclusive German physicist Burkhard Heim, thereby becoming one of the few physicists to collaborate with Heim.
Document 8: Hermann Oberth: Hermann Julius Oberth (] ; 25 June 1894 – 28 December 1989) was an Austro-Hungarian-born German physicist and engineer. He is considered one of the founding fathers of rocketry and astronautics, along with the French Robert Esnault-Pelterie, the Russian Konstantin Tsiolkovsky and the American Robert Goddard.
Document 9: Timeline of space travel by nationality: Since the first human spaceflight by the Soviet Union, citizens of 40 countries have flown in space. For each nationality, the launch date of the first mission is listed. The list is based on the nationality of the person at the time of the launch. Only 3 of the 40 "first flyers" have been women (Helen Sharman for the United Kingdom in 1991, Anousheh Ansari for Iran in 2006, and Yi So-yeon for South Korea in 2008). Only three nations (Soviet Union/Russia, U.S., China) have launched their own manned spacecraft, with the Soviets/Russians and the American programs providing rides to other nations' astronauts. Twenty-six "first flights" occurred on Soviet or Russian flights while the United States carried thirteen.
Document 10: Sigmund Jähn: Sigmund Werner Paul Jähn (born 13 February 1937) is a German cosmonaut and pilot, who in 1978 became the first East German (and German native) to fly in space as part of the Soviet Union's Interkosmos programme.
Document 11: Walter Cunningham: Ronnie Walter Cunningham (born March 16, 1932), (Col, USMCR, Ret.), better known as Walter Cunningham, is a retired American astronaut. In 1968, he was a Lunar Module Pilot on the Apollo 7 mission. He was NASA's third civilian astronaut (after Neil Armstrong and Elliot See), and has also been a fighter pilot, physicist, entrepreneur, venture capitalist, author of "The All-American Boys", lecturer, and host of the radio show "Lift-off to Logic". Walter Cunningham attended UCLA.
Document 12: Hans Schlegel: Hans Wilhelm Schlegel (Überlingen, 3 August 1951) is a German physicist, an ESA astronaut, and a veteran of two NASA Space Shuttle missions.
Document 13: Reinhold Ewald: Dr. Reinhold Ewald (born December 18, 1956) is a German physicist and ESA astronaut.
Document 14: Alexey Leonov: Alexey Arkhipovich Leonov (Russian: Алексе́й Архи́пович Лео́нов ; ] ; born 30 May 1934 in Listvyanka, West Siberian Krai, Soviet Union) is a retired Soviet/Russian cosmonaut, Air Force Major general, writer and artist. On 18 March 1965, he became the first human to conduct extravehicular activity (EVA), exiting the capsule during the Voskhod 2 mission for a 12-minute spacewalk.
Document 15: Vladimir Komarov: Vladimir Mikhaylovich Komarov (Russian: Влади́мир Миха́йлович Комаро́в ; ] ; 16 March 192724 April 1967) was a Soviet test pilot, aerospace engineer and cosmonaut. In October 1964, he commanded Voskhod 1, the first spaceflight to carry more than one crew member. He became the first cosmonaut to fly in space twice when he was selected as the solo pilot of Soyuz 1, the first manned test flight of a new spacecraft. A parachute failure caused his Soyuz capsule to crash into the ground after re-entry on 24 April 1967, making him the first human to die in a space flight.
ground_truth: Ulrich