Like many of New York's richest men who supported the arts, Henry Clay Frick amassed his fortune through sharp—and often ruthless—business tactics. Born in 1849 in a rural Pennsylvania town, Frick sacrificed schooling to work as head bookkeeper in the family business. By 1883, when he was 34, he merged his own company with Andrew Carnegie's to form Carnegie Steel, at a capitalization of $25 million and with a labor force of 30,000.

Frick opposed organized labor his entire life. In 1892, his efforts to slash costs and keep profits up resulted in the Homestead Strike, one of the 19th century's bloodiest labor conflicts. There was even an attempt on Frick's life. In 1899, Frick and Carnegie parted ways on bitter terms that lasted the rest of their lives. Following Frick's resignation from Carnegie Steel, he sued Carnegie and walked away with a $15 million settlement.

Frick's interest in art began in his early 20s, when he filled his clapboard shack with prints and sketches. Though there's little record of Frick's thoughts about the art he went on to collect, it's clear the collections of other New York industrialists inspired him.

After attending the Metropolitan Museum of Art's memorial exhibition for J.P. Morgan in 1914, Frick spent more than $3 million (more than $66 million today) to buy up Limoges enamels, Chinese porcelains, Renaissance bronzes, 18th century French furniture and sculpture, and a variety of other objects. The biggest single purchase was a series of paintings by Jean Honore Fragonard that had been commissioned by one of Louis XV's mistresses.

While many of the city's elite built their homes around entertaining, Frick built his to house his art, making the picture gallery the grandest room. And when he executed his will he made explicit that the home should be open to the city "for the purpose of encouraging and the developing the study of the fine arts, and of advancing the general knowledge of kindred subjects."

Frick died in 1919, just a few months after Andrew Carnegie, and the collection opened to the public in 1935, upon the death of his wife, Adelaide. Many of the rooms look just as Frick left them: the library bookshelves filled, and living room tables topped with Renaissance bronzes and Chinese porcelains.