LeaderPortfolio
Stern
Leonard Stern
Rank #427
UNITED STATESDiversifiedReal estate

Leonard Stern

Net Worth
$8.315B
0% (24h)
Leonard N. Stern, born March 28, 1938, is an American billionaire businessman and philanthropist. He is the Chairman and CEO of The Hartz Group, a privately owned company with a significant real estate portfolio. Stern's wealth is primarily derived from real estate, a field he entered after taking over his family's pet supply business, Hartz Mountain Corporation, in 1959. He expanded the company and later diversified into real estate development. Stern is known for his significant contributions to philanthropy, particularly in education and support for the homeless. His achievements include transforming Hartz Mountain into a market leader and establishing a vast real estate empire.

How to read Leonard Stern's profile

Public net-worth figures are estimates. They combine observable inputs—typically listed equity, disclosed transactions, and market prices—with editorial judgment where filings are incomplete (for example, private holdings, debt, or cross-holdings). For Leonard Stern, we anchor the narrative to Real estate and Real estate, then update the headline number as markets move. The chart on this page is meant to show trajectory, not a certified balance sheet.

When you see $8.315B alongside global rank #427, interpret it as our best synthesis of widely cited ownership and price signals—not a claim about cash on hand. Estimates can diverge from other publishers because of different treatment of options, trusts, charitable vehicles, or illiquid assets. We document the general approach in methodology and welcome corrections via corrections.

Country (UNITED STATES) and career milestones on this page are curated for reader context; they should be verified against primary sources when used for research. Editorial metadata for this profile is refreshed on a rolling basis, with deeper audits at least annually (last noted cycle: 2026).

Looking for depth? When available, the dossier and timeline sections below add long-form context beyond the headline number—prioritize those modules when evaluating claims about strategy, controversies, or philanthropic commitments.

The Full Dossier

Early Life and Education

Leonard Norman Stern was born in New York City on March 28, 1938. He is the son of Max Stern, a German immigrant who founded Hartz Mountain Corporation, a pet supply company. Stern graduated from New York University (NYU) in 1957 with a Bachelor of Science degree and earned an MBA from NYU's business school in 1959.

Rise to Success

Stern took over the family business, Hartz Mountain, in 1959. He expanded the company's focus beyond pet foods to become the leading pet supply manufacturer in the United States. By the early 1960s, he had gained complete control of Hartz Mountain. In 1966, he began diversifying into real estate, acquiring a warehouse in New Jersey. Hartz Mountain Industries, under his leadership, grew to own over 260 properties, primarily industrial and commercial spaces. Stern sold the pet supply division in 2000, allowing him to concentrate on real estate.

Key Business Strategies

Stern's business strategies included aggressive expansion and diversification. He expanded Hartz Mountain's product lines and distribution networks. In real estate, he focused on industrial spaces near New York City to capitalize on logistics demand. He expanded the company's real estate holdings to include more than 210 buildings with over thirty-eight million square feet of industrial, office, retail, and hotel space in New York and New Jersey.

Philanthropy

Stern is a well-known philanthropist. He founded Homes for the Homeless in 1986. He has made significant donations to New York University, including a $30 million donation that led to the renaming of the Leonard N. Stern School of Business. In 2021, he made an additional $50 million donation to NYU Stern to support undergraduate scholarships.

Career Timeline

1988

NYU Stern School of Business

Made a $30 million donation to New York University, resulting in the renaming of the business school in his honor.

2000

Sold the Pet Supply Business

Sold Hartz Mountain Pet Company to focus on real estate and financial interests.

1966

Expanded into Real Estate

Acquired a New Jersey warehouse and started Hartz Mountain Industries' real estate division.

1959

Took over Hartz Mountain Corporation

Assumed leadership of his family's pet supply business.

Philanthropic Impact

HomelessnessN/A

Homes for the Homeless

Founded Homes for the Homeless in 1986, which provides support and shelter to homeless families.

Education$80M+

NYU Stern School of Business

Donations to support the school, including scholarships and the naming of the business school.

Net Worth History

In-Depth Analysis

Early Life and Education

Leonard Norman Stern was born in New York City on March 28, 1938. He is the son of Max Stern, a German immigrant who founded Hartz Mountain Corporation, a pet supply company. Stern graduated from New York University (NYU) in 1957 with a Bachelor of Science degree and earned an MBA from NYU's business school in 1959.

Rise to Success

Stern took over the family business, Hartz Mountain, in 1959. He expanded the company's focus beyond pet foods to become the leading pet supply manufacturer in the United States. By the early 1960s, he had gained complete control of Hartz Mountain. In 1966, he began diversifying into real estate, acquiring a warehouse in New Jersey. Hartz Mountain Industries, under his leadership, grew to own over 260 properties, primarily industrial and commercial spaces. Stern sold the pet supply division in 2000, allowing him to concentrate on real estate.

Key Business Strategies

Stern's business strategies included aggressive expansion and diversification. He expanded Hartz Mountain's product lines and distribution networks. In real estate, he focused on industrial spaces near New York City to capitalize on logistics demand. He expanded the company's real estate holdings to include more than 210 buildings with over thirty-eight million square feet of industrial, office, retail, and hotel space in New York and New Jersey.

Philanthropy

Stern is a well-known philanthropist. He founded Homes for the Homeless in 1986. He has made significant donations to New York University, including a $30 million donation that led to the renaming of the Leonard N. Stern School of Business. In 2021, he made an additional $50 million donation to NYU Stern to support undergraduate scholarships.

Data Sources & Methodology

Figures for Leonard Stern are synthesized from the sources below and cross-checked against our net worth methodology. Estimates may lag market moves; see corrections to report discrepancies.