Leonard Norman Stern is an American businessman, the self-made billionaire Chairman and CEO of Hartz Group (pet food) and Stern Ventures (real estate). Born in New York City, in 1938, his wealth is generational, tied to the Hartz Mountain Corporation, which his father, Max Stern (a German Jewish immigrant), founded in 1926 after starting with a small pet canary importing business.

Stern graduated from New York University (NYU) in 1957 and earned an MBA from NYU Stern School of Business in 1959 (where he later donated $30 million to name the school). His career is defined by aggressive diversification into real estate development and pet food manufacturing.

• Hartz Group (Chairman & CEO): The core private asset, a global leader in pet supplies and food (brands include Hartz Mountain).
• Stern Ventures (Chairman): His major real estate development and investment company (operating 46 million sq. ft. of properties in New Jersey and New York).
• Academic Philanthropy: He donated $30 million to NYU Stern School of Business (named in his honor).
• Controversy: He was involved in a high-profile dispute with the Village Voice newspaper (which he acquired and later sold) over journalistic integrity.

Leonard Stern's strategic genius was his pivot to massive real estate development in New Jersey. He joined the family's pet supply business in 1959 and assumed leadership. He used the immense cash flow from Hartz Mountain to acquire and develop 46 million square feet of commercial and industrial property in the New Jersey Meadowlands (spearheading the industrialization of the region).

His structural contribution is immense: developing major real estate infrastructure in New Jersey and New York. His wealth is secured by the colossal, long-term, stable profitability of the privately held Hartz pet supply business and the vast appreciation of his commercial property portfolio. He is a major philanthropist, notably funding NYU Stern School of Business.

Leonard Stern's social impact is structural, stemming from Stern Ventures' role in providing massive commercial and industrial infrastructure in the New York/New Jersey area, creating thousands of jobs. His personal philanthropy is massive: his $30 million gift to NYU (naming the business school) provides a major structural contribution to business education and financial literacy.

His structural contribution is tied to his belief in entrepreneurship and the power of real estate development to transform regional economies.

Leonard Stern maintains the professional, composed style of a real estate executive. His attire is consistently formal and high-quality, favoring tailored suits. His aesthetic reflects serious authority and stability, typical of a leader in the high-stakes property development sector.

Residing in New York City and Palm Beach, Florida, his luxury is the immense security and financial reward derived from his multi-billion dollar fortune. His life is dedicated to real estate development, corporate governance, and philanthropy.