Title: Johann Heinrich Lambert
Content:  Johann Heinrich Lambert (, Jean-Henri Lambert in French; 26 or 28 August 1728 – 25 September 1777) was a Swiss-French polymath who made important contributions to the subjects of mathematics, physics (particularly optics), philosophy, astronomy and map projections.
Title: Johann Heinrich Lambert
Content:  Lambert was born in 1728 into a Huguenot family in the city of Mulhouse (now in Alsace, France), at that time an exclave of Switzerland. Some sources give 26 August as his birth date and others 28 August. Leaving school at 12, he continued to study in his free time whilst undertaking a series of jobs. These included assistant to his father (a tailor), a clerk at a nearby iron works, a private tutor, secretary to the editor of Basler Zeitung and, at the age of 20, private tutor to the sons of Count Salis in Chur. Travelling Europe with his charges (1756–1758) allowed him to meet established mathematicians in the German states, The Netherlands, France and the Italian states. On his return to Chur he published his first books (on optics and cosmology) and began to seek an academic post. After a few short posts he was rewarded (1763) by an invitation to a position at the Prussian Academy of Sciences in Berlin, where he gained the sponsorship of Frederick II of Prussia, and became a friend of Euler. In this stimulating and financially stable environment, he worked prodigiously until his death in 1777.
Title: Lambert (unit)
Content:  The lambert (symbol L, la or Lb) is a non-SI metric unit of luminance named for Johann Heinrich Lambert (1728–1777), a Swiss mathematician, physicist and astronomer. A related unit of luminance, the foot-lambert, is used in the lighting, cinema and flight simulation industries. The SI unit is the candela per square metre (cd/m2).
Title: Johann Heinrich Lambert
Content:  of perfect diffusion in his 1760 book Photometria. He wrote a classic work on perspective and contributed to geometrical optics. The non-SI unit of luminance, Lambert, is named in recognition of his work in establishing the study of photometry. Lambert was also a pioneer in the development of three-dimensional colour models. Late in life, he published a description of a triangular colour pyramid (Farbenpyramide), which shows a total of 107 colours on six different levels, variously combining red, yellow and blue pigments, and with an increasing amount of white to provide the vertical component. His investigations were built on the earlier theoretical proposals of Tobias Mayer, greatly extending these early ideas. Lambert was assisted in this project by the court painter Benjamin Calau.
Title: Johann Heinrich Lambert
Content:  In his main philosophical work, Neues Organon (New Organon, 1764), Lambert studied the rules for distinguishing subjective from objective appearances. This connects with his work in the science of optics. In 1765 he began corresponding with Immanuel Kant who intended to dedicate to him the Critique of Pure Reason but the work was delayed, appearing after his death.
Title: Joseph Hamilton Lambert
Content:  Joseph Hamilton Lambert (December 1, 1825 – November 12, 1909), was an American pioneer of Oregon and an orchardist who developed the Lambert cherry. A native of Indiana, he also served as a county commissioner in Multnomah and Clackamas counties in Oregon.
Title: Henri Lambert
Content:  Henri Lambert (1862–1934) was a Belgian engineer and glass works owner at Charleroi near Brussels. His glass works was the largest in the world in that time. He was one of the first occupied with social economy. He spoke Walloon with his blue collar workers, which was exceptional in that time. He was a prolific writer (in French) of articles for newspaper and political journals, brochures, and books on political philosophy, and had several of his works translated into German and English. He favoured individualism, free trade, and international peace. He also wrote works about corporations, trade unions, government, democracy, and representation, voicing bold and well-intentioned ideas (which may not be altogether consistent). But his criticism of the principle of limited liability in connection with corporations is an original point which seems to have attracted attention at the turn of the century, as well as his ideas about the organisation of trade unions. He was called upon to address lawyers' and economists' associations and other bodies.
Title: Johann Heinrich Lambert
Content:  Lambert propounded the ideology of observing periodic phenomena first, try to derive their rules and then gradually expand the theory. He expressed his purpose in meteorology as follows: "It seems to me that if one wants to make meteorology more scientific than it currently is, one should imitate the astronomers who began with establishing general laws and middle movements without bothering too much with details first. [...] Should one not do the same in meteorology? It is a sure fact that meteorology has general laws and that it contains a great number of periodic phenomena. But we can but scarcely guess these latter. Only few observations have been made so far, and between these one cannot find connections." - Johann Heinrich Lambert To obtain more and better data of meteorology, Lambert proposed to establish a network of weather stations around the world, in which the various weather configurations (rain, clouds, dry ...) would be recorded – the methods that are still used nowadays. He also devoted himself to the improvement of the measuring instruments and accurate concepts for the advancement of meteorology. This results in his published works in 1769 and 1771 on hygrometry and hygrometers.
Title: Emil Johann Lambert Heinricher
Content:  Emil Johann Lambert Heinricher (14 November 1856 – 13 July 1934) was an Austrian botanist from Laibach (Ljubljana). In 1879 he received his doctorate from the University of Graz, where after graduation, he served as an assistant to botanist Hubert Leitgeb. In 1889 he became an associate professor of botany, which was followed by a full professorship at the University of Innsbruck in 1891. While at Innsbruck, he created a new botanical garden in nearby Hötting. Through support from the Austrian Academy of Sciences, he took part in a study trip to Java (1903/04). While there, he spent time working at the Buitenzorg 
Title: Lambert cylindrical equal-area projection
Content:  The projection was invented by the Swiss mathematician Johann Heinrich Lambert and described in his 1772 treatise, Beiträge zum Gebrauche der Mathematik und deren Anwendung, part III, section 6: Anmerkungen und Zusätze zur Entwerfung der Land- und Himmelscharten, translated as, Notes and Comments on the Composition of Terrestrial and Celestial Maps. Lambert's projection is the basis for the cylindrical equal-area projection family. Lambert chose the equator as the parallel of no distortion. By multiplying the projection's height by some factor and dividing the width by the same factor, the regions of no distortion can be moved to any desired pair of parallels north and south of the equator. These variations, particularly the Gall–Peters projection, are more commonly encountered in maps than Lambert’s original projection due to their lower distortion overall.

Question: What is Johann Heinrich Lambert's occupation?
Answer: astronomer.
physicist.
mathematician.