Our father, Tian-shu Zhang, was born on June 16, 1938 to Mr. and Mrs. Zhang Jian Chuang in a small mountain village, Houyang, in Chang Le Township outside the city of Fuzhou, Fujian, China. As the only child, our father had to help his family with farming and herding cows. Thus, he was not able to attend school until 1953, when he was 15 years old. Being a smart and hardworking student, he completed elementary school in a year and a half, then attended Chang Le No. 1 Middle/High School for six years. In May 1960, before his high school graduation, he married his life-long companion, Shu-zhen Zheng. He graduated as a top student in his class and was accepted to Fuzhou University majoring in Applied Mathematics. After earning a Bachelors degree, our father was immediately hired as a teaching assistant at Fuzhou University. Soon, he was promoted to a lecturer and later an associate professor in the universitys Mathematics Department. He continued his career there until we immigrated to the United States in 1988. Since then, our parents have resided in Philadelphia. We came to the US with almost no money or possessions. To support our family, our father took up a blue-collar job at Humphrys Textile Products in West Philadelphia. He worked long hours at the factory and sometimes helped our uncle at his Chinese takeout restaurant afterward. With the knowledge and skills he gained as a University Professor, he became a problem solver for the factory; he optimized the cutting patterns of their fabrics to minimize waste. With his ability and willingness to learn, he became the factory's most valuable operator. Furthermore, he was highly respected by the factory owner and fellow workers alike. Our father sacrificed his own career for us to ensure we have a higher chance of success in career and life, and, more importantly, to live in a free society. After retiring from Humphrys Textile Products in 2003, our father was able to enjoy his retirement life by actively participating and greatly contributed to the projects and activities organized by Fujian Houyu Association of Philadelphia. Dad is survived by our Mom (his wife of 60 years), us three daughters Bi-rong, Bi-min (spouse: Bob Newby), and Bi-hang (spouse: Huy Seng), six grandchildren Xin He (spouse: Duo Ni Li), Sean Newby, Eli Newby, Kevin Seng, Mathew Seng, and Isabel Newby, and one great grandchild (Lavender He). We are grateful to our Dad for everything he had done for us!