Given the task definition, example input & output, solve the new input case.
In this task, you're expected to write answers to questions involving multiple references to the same entity. The answer to the question should be unambiguous and a phrase in the paragraph. Most questions can have only one correct answer.
Example: Passage: Nearing London, Oliver encounters Jack Dawkins, a pickpocket more commonly known by the nickname the "Artful Dodger", and his sidekick, a boy of a humorous nature named Charley Bates, but Oliver's innocent and trusting nature fails to see any dishonesty in their actions. The Dodger provides Oliver with a free meal and tells him of a gentleman in London who will "give him lodgings for nothing, and never ask for change". Grateful for the unexpected assistance, Oliver follows the Dodger to the "old gentleman's" residence. In this way Oliver unwittingly falls in with an infamous Jewish criminal known as Fagin, the gentleman of whom the Artful Dodger spoke. Ensnared, Oliver lives with Fagin and his gang of juvenile pickpockets in their lair at Saffron Hill for some time, unaware of their criminal occupations. He believes they make wallets and handkerchiefs.
Question: Who believes Fagin's gang make wallets and handkerchiefs?
Output: Oliver.
In the sentence "He believes they make wallets and handkerchiefs", the pronoun "he" refers to name "Oliver".

New input case for you: Passage: Kennedy's assassination led indirectly to another commission for Pei's firm. In 1964 the acting mayor, Erik Jonsson, began working to change the community's image. Dallas was known and disliked as the city where the president had been killed, but Jonsson began a program designed to initiate a community renewal. One of the goals was a new city hall, which could be a "symbol of the people". Jonsson, a co-founder of Texas Instruments, learned about Pei from his associate Cecil Howard Green, who had recruited the architect for MIT's Earth Sciences building.Pei's approach to the new Dallas City Hall mirrored those of other projects; he surveyed the surrounding area and worked to make the building fit. In the case of Dallas, he spent days meeting with residents of the city and was impressed by their civic pride. He also found that the skyscrapers of the downtown business district dominated the skyline, and sought to create a building which could face the tall buildings and represent the importance of the public sector. He spoke of creating "a public-private dialogue with the commercial high-rises".Working with his associate Theodore Musho, Pei developed a design centered on a building with a top much wider than the bottom; the facade leans at an angle of 34 degrees. A plaza stretches out before the building, and a series of support columns holds it up. It was influenced by Le Corbusier's High Court building in Chandigarh, India; Pei sought to use the significant overhang to unify building and plaza. The project cost much more than initially expected, and took 11 years. Revenue was secured in part by including a subterranean parking garage. The interior of the city hall is large and spacious; windows in the ceiling above the eighth floor fill the main space with light.
The city of Dallas received the building well, and a local television news crew found unanimous approval of the new city hall when it officially opened to the public in 1978. Pei himself considered the project a success, even as he worried about the arrangement of its elements. He said: "It's perhaps stronger than I would have liked; it's got more strength than finesse." He felt that his relative lack of experience left him without the necessary design tools to refine his vision, but the community liked the city hall enough to invite him back. Over the years he went on to design five additional buildings in the Dallas area.
Question: What is the name of the architect recruited for MIT's Earth Sciences building?
Output:
Pei.