Harry Lefrak (1885-1963) was a prominent builder of middle-income apartments around New York City, and, with his wife Sarah Lefrak (1888-1962), dedicated time and money to charitable causes.

Harry was born in Russia (Belarus) on March 31, 1885. He spent his early years in Palestine before moving to New York in the winter of 1900 with just some spare change to his name. He immediately found himself work, doing errands and carpentry in the Lower East Side.

By 1905 he'd saved enough money to buy a carpentry shop in Manhattan when his employer there moved to a larger space. By the end of World War I, he sold that business for $250,000 and became a full-time homebuilder. He first built single-family homes in Brooklyn, and his construction enterprise grew steadily. He soon recognized a need for higher-density homes, and began building apartments for middle-income families. As it grew, the Lefrak Organization built 400 such buildings across the city.

His work is said to have influenced the face of several neighborhoods. In Sheepshead Bay, Brooklyn, the Lefrak Organization built the 500-apartment Kings Bay Houses, along with a giant shopping area nearby. He also saw the construction of the first part of the sprawling Lefrak City, which was built to house 25,000 people.

By 1948, Henry had left his business in the hands of his son, Samuel J. Lefrak. Henry then spent more time on charitable activities, including the Lefrak Foundation, which he and Sarah had founded, which helped build several hospitals and medical centers in Israel. He also tried to avoid the stereotype of the evil landlord. In 1956, he heard about a producer of an off-Broadway production—which was about a tenant who murders his merciless landlord-—who owed the theater nearly $300 in rent. Henry, noting the irony of the play's subject, paid the bill.

Sarah was also born in Russia, on November 15, 1888, but moved to Long Beach on Long Island. She and Henry had Samuel, their first child, in 1918 when they lived at 246 E. 52st Street in Manhattan. They moved to Forest Hills in 1953. In addition to the Lefrak Foundation, she worked with charitable organizations such as the Women's Zionist Organization of American and State of Israel Bonds.

Sarah passed away on November 19, 1962 at the age of 74, with Henry following a few months later, on July 1, 1963 at the age of 78. In addition to his son Samuel, Henry was survived by his daughters, Sophie Menowitz and Fagel Lipschutz, his sister, Molly Alpert, and seven grandchildren and four great-grandchildren. At the time of their death, Sarah and Henry lived at 103-25 68th Avenue. They are buried at Mount Hebron Cemetery.

In 1965, the City Council approved Councilmember Arthur J. Katzman's bill to rename the triangle at Queens Boulevard and 65th Avenue as Lefrak Memorial Square. Mayor Robert F. Wagner soon approved the bill, which was made to honor the roles they played in community and philanthropic activities in Queens.