Background: Sir David Frederick Attenborough  (UK: ; born 8 May 1926) is an English broadcaster and naturalist. He is best known for writing and presenting, in conjunction with the BBC Natural History Unit, the nine natural history documentary series that form the Life collection, which form a comprehensive survey of animal and plant life on Earth. He is a former senior manager at the BBC, having served as controller of BBC Two and director of programming for BBC Television in the 1960s and 1970s. He is the only person to have won BAFTAs for programmes in each of black and white, colour, HD, 3D and 4K.
Context: After leaving the Navy, Attenborough took a position editing children's science textbooks for a publishing company. He soon became disillusioned with the work and in 1950 applied for a job as a radio talk producer with the BBC. Although he was rejected for this job, his CV later attracted the interest of Mary Adams, head of the Talks (factual broadcasting) department of the BBC's fledgling television service.  Attenborough, like most Britons at that time, did not own a television, and he had seen only one programme in his life. However, he accepted Adams' offer of a three-month training course, and in 1952 he joined the BBC full-time. Initially discouraged from appearing on camera because Adams thought his teeth were too big, he became a producer for the Talks department, which handled all non-fiction broadcasts. His early projects included the quiz show Animal, Vegetable, Mineral? and Song Hunter, a series about folk music presented by Alan Lomax.  Attenborough's association with natural history programmes began when he produced and presented the three-part series Animal Patterns. The studio-bound programme featured animals from London Zoo, with the naturalist Julian Huxley discussing their use of camouflage, aposematism and courtship displays. Through this programme, Attenborough met Jack Lester, the curator of the zoo's reptile house, and they decided to make a series about an animal-collecting expedition. The result was Zoo Quest, first broadcast in 1954, where Attenborough became the presenter at short notice due to Lester being taken ill.  In 1957, the BBC Natural History Unit was formally established in Bristol. Attenborough was asked to join it, but declined, not wishing to move from London where he and his young family were settled. Instead, he formed his own department, the Travel and Exploration Unit, which allowed him to continue to front Zoo Quest as well as produce other documentaries, notably the Travellers' Tales and Adventure series.  In the early 1960s, Attenborough resigned from the permanent staff of the BBC to study for a postgraduate degree in social anthropology at the London School of Economics, interweaving his study with further filming. However, he accepted an invitation to return to the BBC as controller of BBC Two before he could finish the degree.
Question: What did he do at the BBC?
Answer: he accepted Adams' offer of a three-month training course, and in 1952 he joined the BBC full-time.

Background: Hans Lundgren was born on 3 November 1957 in Spanga, the son of Sigrid Birgitta (nee Tjerneld), a language teacher, and Karl Johan Hugo Lundgren, an engineer and economist for the Swedish government. He lived in Spanga until the age of 13, when he moved to his grandparents' home in Nyland, Angermanland. Some sources wrongly state 1959 as his year of birth, but Lundgren himself has confirmed it to be 1957. He has two sisters and an older brother; he was raised in the Lutheran church.
Context: Lundgren resides in Los Angeles, California. He speaks Swedish and English, as well as smaller amounts of French, German, Italian, Japanese, and Spanish, but is not fluent in five languages as has often been reported.  He is an avid football fan. He supported Everton FC when he lived in Europe, but developed more of an interest in international football tournaments (such as the UEFA European Championship and the FIFA World Cup) after moving to Los Angeles.  During the 1980s, Lundgren had relationships with Jamaican singer Grace Jones and American model Paula Barbieri. In 1994, he married Anette Qviberg, a jewellery designer and fashion stylist, in Marbella. The couple decided they liked Marbella so much that they rented accommodation there for years, before eventually buying a family home there. They have two daughters: Ida Sigrid Lundgren and Greta Eveline Lundgren, both born in Stockholm. Lundgren and Qviberg have cited the reason for living away from Hollywood is that they want to give their children as normal a childhood as possible. His father died in 2000.  In early May 2009, Lundgren's Marbella home was reportedly broken into by three masked burglars who tied up and threatened his wife, but fled when they found a family photo and realized that the house was owned by Lundgren. Lundgren later stated he believed the intruders to be Eastern European and had asked contacts in Bulgaria to investigate them, but to no avail. After the incident, Lundgren's elder daughter, Ida, suffered from PTSD. His wife was the "most traumatized", and as of 2011, they are divorced.  Lundgren currently lives in Los Angeles, California. He broke up with his girlfriend, Jenny Sandersson, in 2014 and it was said that they were secretly engaged and married later.
Question: when did they marry?
Answer: In 1994,

Background: Lee de Forest was born in 1873 in Council Bluffs, Iowa, the son of Anna Margaret (nee Robbins) and Henry Swift DeForest. He was a direct descendant of Jesse de Forest, the leader of a group of Walloon Huguenots who fled Europe in the 17th Century due to religious persecution. De Forest's father was a Congregational Church minister who hoped his son would also become a pastor. In 1879 the elder de Forest became president of the American Missionary Association's Talladega College in Talladega, Alabama, a school "open to all of either sex, without regard to sect, race, or color", and which educated primarily African-Americans.
Context: One of de Forest's areas of research at Federal Telegraph was improving the reception of signals, and he came up with the idea of strengthening the audio frequency output from a grid Audion by feeding it into a second tube for additional amplification. He called this a "cascade amplifier", which eventually consisted of chaining together up to three Audions.  At this time the American Telephone and Telegraph Company was researching ways to amplify telephone signals to provide better long-distance service, and it was recognized that de Forest's device had potential as a telephone line repeater. In mid-1912 an associate, John Stone Stone, contacted AT&T to arrange for de Forest to demonstrate his invention. It was found that de Forest's "gassy" version of the Audion could not handle even the relatively low voltages used by telephone lines. (Due to the way he constructed the tubes, de Forest's Audions would cease to operate with too high a vacuum.) However, careful research by Dr. Harold D. Arnold and his team at AT&T's Western Electric subsidiary determined that by improving the tube's design, it could be more fully evacuated, and the high vacuum allowed it to successfully operate at telephone line voltages. With these changes the Audion evolved into a modern electron-discharge vacuum tube, using electron flows rather than ions. (Dr. Irving Langmuir at the General Electric Corporation made similar findings, and both he and Arnold attempted to patent the "high vacuum" construction, but the U.S. Supreme Court ruled in 1931 that this modification could not be patented).  After a delay of ten months, in July 1913 AT&T, through a third party who disguised his link to the telephone company, purchased the wire rights to seven Audion patents for $50,000. De Forest had hoped for a higher payment, but was again in bad financial shape and was unable to bargain for more. In 1915, AT&T used the innovation to conduct the first transcontinental telephone calls, in conjunction with the Panama-Pacific International Exposition at San Francisco.
Question: did he have other areas of research?
Answer: