Problem: Background: Fazlur Rahman Khan (Bengali: phjlur rhmaan khaan, Fozlur Rohman Khan) (3 April 1929 - 27 March 1982) was a Bangladeshi-American structural engineer and architect, who initiated important structural systems for skyscrapers. Considered the "father of tubular designs" for high-rises, Khan was also a pioneer in computer-aided design (CAD). He was the designer of the Sears Tower, since renamed Willis Tower, the tallest building in the world from 1973 until 1998, and the 100-story John Hancock Center. Khan, more than any other individual, ushered in a renaissance in skyscraper construction during the second half of the 20th century.
Context: Among Khan's other accomplishments, he received the Wason Medal (1971) and Alfred Lindau Award (1973) from the American Concrete Institute (ACI); the Thomas Middlebrooks Award (1972) and the Ernest Howard Award (1977) from ASCE; the Kimbrough Medal (1973) from the American Institute of Steel Construction; the Oscar Faber medal (1973) from the Institution of Structural Engineers, London; the International Award of Merit in Structural Engineering (1983) from the International Association for Bridge and Structural Engineering IABSE; the AIA Institute Honor for Distinguished Achievement (1983) from the American Institute of Architects; and the John Parmer Award (1987) from Structural Engineers Association of Illinois and Illinois Engineering Hall of Fame from Illinois Engineering Council (2006). Khan was cited five times by Engineering News-Record as among those who served the best interests of the construction industry, and in 1972 he was honoured with ENR's Man of the Year award. In 1973 he was elected to the National Academy of Engineering. He received Honorary Doctorates from Northwestern University, Lehigh University, and the Swiss Federal Institute of Technology Zurich (ETH Zurich). The Council on Tall Buildings and Urban Habitat named one of their CTBUH Skyscraper Awards the Fazlur Khan Lifetime Achievement Medal after him, and other awards have been established in his honour, along with a chair at Lehigh University. Promoting educational activities and research, the Fazlur Rahman Khan Endowed Chair of Structural Engineering and Architecture honours Khan's legacy of engineering advancement and architectural sensibility. Dan Frangopol is the first holder of the chair. Khan was mentioned by president Obama in 2009 in his speech in Cairo, Egypt when he cited the achievements of America's Muslim citizens. Khan was the subject of the Google Doodle on April 3, 2017, marking what would have been his 88th birthday.
Question: Is he considered to be a leader in the field of Engineering?
Answer:

Background: Marian Anderson (February 27, 1897 - April 8, 1993) was an African-American contralto and one of the most celebrated singers of the twentieth century. Music critic Alan Blyth said: "Her voice was a rich, vibrant contralto of intrinsic beauty." Most of her singing career was spent performing in concert and recital in major music venues and with famous orchestras throughout the United States and Europe between 1925 and 1965. Although offered roles with many important European opera companies, Anderson declined, as she had no training in acting.
Context: In 1933, Anderson made her European debut in a concert at Wigmore Hall in London, where she was received enthusiastically. She spent the early 1930s touring throughout Europe where she did not encounter the racial prejudices she had experienced in America. In the summer of 1930, she went to Scandinavia, where she met the Finnish pianist Kosti Vehanen who became her regular accompanist and her vocal coach for many years. She also met Jean Sibelius through Vehanen after he had heard her in a concert in Helsinki. Moved by her performance, Sibelius invited them to his home and asked his wife to bring champagne in place of the traditional coffee. Sibelius commented to Anderson of her performance that he felt that she had been able to penetrate the Nordic soul. The two struck up an immediate friendship, which further blossomed into a professional partnership, and for many years Sibelius altered and composed songs for Anderson to perform. He created a new arrangement of the song "Solitude" and dedicated it to Anderson in 1939. Originally The Jewish Girl's Song from his 1906 incidental music to Belshazzar's Feast, it later became the "Solitude" section of the orchestral suite derived from the incidental music. In 1934, impresario Sol Hurok offered Anderson a better contract than she previously had with Arthur Judson. He became her manager for the rest of her performing career and through his persuasion she came back to perform in America. In 1935, Anderson made her first recital appearance in New York at Town Hall, which received highly favorable reviews by music critics. She spent the next four years touring throughout the United States and Europe. She was offered opera roles by several European houses but, due to her lack of acting experience, Anderson declined all of those offers. She did, however, record a number of opera arias in the studio, which became bestsellers. Anderson, accompanied by Vehanen, continued to tour throughout Europe during the mid-1930s. She visited Eastern European capitals and Russia and returned again to Scandinavia, where "Marian fever" had spread to small towns and villages where she had thousands of fans. She quickly became a favorite of many conductors and composers of major European orchestras. During a 1935 tour in Salzburg, the conductor Arturo Toscanini told her she had a voice "heard once in a hundred years". In the late 1930s, Anderson gave about 70 recitals a year in the United States. Although by then quite famous, her stature did not completely end the prejudice she confronted as a young black singer touring the United States. She was still denied rooms in certain American hotels and was not allowed to eat in certain American restaurants. Because of this discrimination, Albert Einstein, a champion of racial tolerance, hosted Anderson on many occasions, the first being in 1937 when she was denied a hotel before performing at Princeton University. She last stayed with him months before he died in 1955.
Question: Was there ever any conflicts?
Answer:
her stature did not completely end the prejudice she confronted as a young black singer touring the United States.