Chriet Titulaer (May 9, 1943 – April 23, 2017), born in Hout-Blerick, Venlo, Limburg, was a Dutch astronomer, television presenter and popular science and technology writer. He lived in Houten, Utrecht. Biography Titulaer went to high school at the St.-Thomascollege in Venlo (now the Valuas College). He studied maths and physics at the University of Utrecht with a major in astronomy. At the university he joined the student association CS Veritas. During his studies he founded (together with Ton Smit) the Venlo chapter of the Nederlandse Vereniging voor Weer- en Sterrenkunde (Dutch association for meteorology and astronomy) on April 18, 1965 (since 1990 known as the Weer- en Sterrenkundige Vereniging "Jean Delsing"). The next year he organized the exposition Mens en het Heelal (Man and the Universe), then the largest meteorology, astronomy and space travel exposition ever held in the Netherlands. After having lived and worked in the United States and France (both for two years) he became a presenter of Dutch radio and television programmes about science and technology. Between 1969 and 1990 he was often seen on television. His popularity began as co-presenter of the live transmission of the Apollo 11 moon landing (as well as the later moon landings), together with Henk Terlingen (popularly known as "Apollo Henkie"). The transmission rated at an audience share of 100%, a feat never again repeated on Dutch television. He also was the commentator for the first launch of Space Shuttle Columbia in 1981. Television producer and writer In 1983 Titulaer began his own television production company Chriet Titulaer Producties BV and did much work for Teleac and the TROS. He presented popular science programmes such as Wondere Wereld (Miraculous World) and television courses such as Moderne Sterrenkunde (Modern Astronomy) and Nederland en het Weer (The Netherlands and the Weather). Later activities In 1986 he organized the space travel exhibition Space '86 in the Jaarbeurs in Utrecht. As a promotion a true to size painting of a Saturn V rocket was put on the side of the Dom Tower of Utrecht as both the rocket and the church tower are about 110 metres tall. Titulaer wrote many books about popular science, computers, IT, meteorology and astronomy. He was an active advocate for science and technology and was often asked as a keynote speaker for events related to these areas, and for theme days on schools and universities. His appearances on radio