In December 1947 Ying arrived in the United States. Tsien was back teaching and doing his own research at MIT. They lived in an apartment on 9 Chauncy Street, which stood across the Charles River and within walking distance of Harvard Square. With Ying, Tsien now had a companion with whom he could explore the musical culture of Boston. He joined the American Academy of Arts and Sciences in Boston and bought season tickets for the Boston Symphony Orchestra. Both he and Ying avidly collected records and attended the symphonies, concerts, and operas given in the city. They also went to art galleries together. Occasionally, they spent an evening with Tsien's friend Rene Miller and his wife.
The early part of 1948 was an industrious time for Tsien. He had a huge teaching load at MIT and gave two courses in aerodynamics, one course in rockets, and seminar lectures on structures and stability In January he presented a paper on wind tunnel testing problems at a conference in New York, and between March and September he coauthored some journal articles with graduate students and colleagues. He also served on the aerospace vehicles panel of the Scientific Advisory Board ( SAB), the purpose of which was to inform the chief of staff of the U.S. Air Force of the latest scientific developments. Within