The Berlin scientific balloon flights (Berliner wissenschaftliche Luftfahrten) were a series of 65 manned and 29 unmanned balloon flights carried out between 1888 and 1899 by the German Society for the Promotion of Aeronautics to investigate the atmosphere above the planetary boundary layer. The flights were organized by Richard Aßmann, Professor at the Meteorological Institute of Berlin, who also developed the most important of the measurement instruments employed by them. The execution lay primarily in the hands of the military airship pilot Hans Groß and the meteorologist Arthur Berson. In 1894, Berson flew with the balloon Phönix to a height of 9155 meters, the highest that any human had flown until then.