Private Credit
A Career Built Around Credit Investing
Leonard “Len” M. Tannenbaum has spent more than three decades investing in credit, underwriting businesses, and building and leading investment platforms.
In 1998, he founded the business that became Fifth Street, ultimately developing it into a national alternative credit platform providing capital to small and middle-market companies. Over the course of his career, Len’s experience has spanned direct lending, private investment funds, Business Development Companies (BDCs), permanent-capital vehicles, public-company leadership, and investing through multiple economic and credit cycles.
Today, Len continues that work as Founder of Tannenbaum Capital Group (TCG), an investment platform bringing together affiliated asset managers focused on private credit, opportunistic credit, and real estate lending.
Len began his career as an equity analyst in Merrill Lynch’s small-company group, where he learned to evaluate businesses through the lens of growth, management, competitive position, and valuation. Over time, however, his investment approach increasingly shifted toward structured equity, mezzanine and convertible debt, and ultimately direct lending.
What drew Len to credit was its discipline. Rather than focusing primarily on how much a business might be worth in the future, credit investing demanded a different set of questions: How does the company generate cash? How much debt can it responsibly support? What protections are built into the investment? What happens when expectations are not met? And, ultimately, how does the investor get repaid?
That focus on cash flow, structure, repayment, and downside protection resonated with Len’s approach to investing and became a defining principle throughout his career.
It also shaped the investment philosophy he would carry into Fifth Street and, decades later, Tannenbaum Capital Group: understand the business, structure investments thoughtfully, protect capital, and remain disciplined about risk.
Lending to Middle-Market Businesses
Much of Len’s career in private credit has been built around lending to small and middle-market companies—businesses that can offer compelling opportunities but often require a deeper level of underwriting and judgment.
Unlike larger companies with broad access to capital, middle-market businesses may rely on a smaller number of customers, operate with leaner management teams, or face greater exposure to shifts in their industries. Understanding those dynamics is essential to evaluating the underlying credit.
For Len, underwriting has never been about financial statements alone. It requires understanding how the business actually works, the quality and incentives of its management team, the competitive and industry environment, why the company needs capital, and how that capital will ultimately be repaid.
That combination of financial analysis and fundamental business judgment has remained central to Len’s approach to middle-market credit throughout his career.
Experience in the
Middle Market
Len’s approach to middle-market credit focuses on understanding both the business and the structure of the investment:
- Cash Flow — Is it consistent, durable, and sufficient to support debt?
- Competitive Position — What differentiates the business and protects its market position?
- Management — Does the leadership team have the experience to execute through changing conditions?
- Capital Structure — How much leverage exists, and what additional capital may be required?
- Alignment — How much capital and commitment do owners and sponsors have at risk?
- Loan Structure — What seniority, collateral, covenants, and other protections support the investment?
- Downside Protection — Can the business continue to perform and service its obligations in a more difficult environment?
For Len, disciplined credit underwriting is as much about understanding what can go wrong as recognizing what can go right.
Len’s approach to underwriting
Return Matters. Repayment Comes First.
Businesses can raise debt capital in several ways. The right source depends on the company, the purpose of the financing, market conditions, and the needs of both borrower and lender.
Protecting Capital Starts with Good Underwriting
Len’s approach to credit begins with a fundamental question: What is the lender relying on to get repaid?
An attractive yield means little if the borrower cannot meet its obligations. That principle has shaped Len’s emphasis on disciplined underwriting, thoughtful loan structure, and a clear understanding of downside risk.
His approach focuses on several fundamentals:
- Cash Flow — What is the primary source of repayment?
- Leverage — Can the business comfortably support its debt?
- Collateral — What assets provide additional protection?
- Management & Ownership — Are experience, incentives, and capital aligned?
- Industry Risk — How resilient is the business through changing conditions?
- Loan Protections — Do the covenants and documentation provide appropriate safeguards?
- Downside Scenarios — What happens if the original investment thesis does not go as planned?
For Len, good underwriting does not eliminate risk—it identifies it, structures around it, and helps determine whether the potential return justifies the risk being taken.
Lessons Across Credit Cycles
Over more than three decades, Len has invested through periods of economic expansion, market disruption, tightening liquidity, rising and falling interest rates, and increasing borrower stress.
Those cycles have reinforced a central lesson: credit discipline matters most when risk appears easiest to ignore.
When capital is abundant, competition can drive lenders toward higher leverage, lower returns, weaker protections, and increasingly optimistic assumptions. It is often only when conditions change that the consequences become clear—through refinancing pressure, covenant issues, restructurings, and defaults.
Len’s experience has also taught him to distinguish between temporary market dislocation and permanent impairment. Periods of stress can expose weaknesses in existing investments, but they can also create compelling opportunities for investors with available capital, patient funding, and the experience to evaluate complexity.
For Len, credit cycles are a reminder that markets change, liquidity comes and goes, and investment structures are tested over time. What remains constant is the importance of disciplined underwriting, protecting capital, and being prepared to invest when others may be constrained.
Experience in Permanent Capital
A significant part of Len’s career has been devoted to building and leading permanent-capital investment vehicles, particularly Business Development Companies (BDCs).
Through Fifth Street, Len combined private credit investing with the responsibilities of managing publicly traded investment companies—gaining experience across underwriting, portfolio construction, valuation, governance, capital formation, regulatory reporting, and shareholder communication.
Over the course of his career, Len has underwritten more than $15 billion in loans and taken five investment entities public, providing him with a perspective shaped by both private-market investing and public-market accountability.
That experience reinforced an important principle in Len’s approach to credit: the structure and duration of capital matter alongside the quality of the underlying investments. Matching long-duration assets with appropriate funding can provide greater flexibility through market cycles and reduce the pressure created when capital and investment horizons are misaligned.
For Len, permanent capital is ultimately about alignment—between assets and liabilities, managers and investors, and investment strategy and the capital supporting it.
Len’s perspective
Experience, Data, and Investment Judgement
Len has described investment judgment as something developed through accumulated experience rather than intuition alone.
As he told Wharton Magazine:
“You can’t have a good gut instinct unless you have enough data points. Data points take time to generate, so you just need to be patient.”
For Len, those data points include individual loans, company-management decisions, changing market conditions, public-company responsibilities, successful investments, difficult credits, and lessons from building investment businesses.
That experience continues to inform his views on private credit, underwriting, risk, market cycles, and the development of new investment platforms.
Private Credit — Frequently Asked Questions
What is Len Tannenbaum’s experience in private credit?
Len has more than three decades of experience investing in credit and building investment businesses. He founded Fifth Street in 1998 and developed it into a national alternative credit platform. His experience spans direct lending, middle-market finance, private funds, Business Development Companies (BDCs), permanent-capital vehicles, and public-company leadership.
What types of companies has Len financed?
Much of Len’s career has focused on providing capital to small and middle-market businesses for growth, acquisitions, refinancing, recapitalizations, and ownership transitions.
How does Len evaluate a credit investment?
Len focuses first on the path to repayment. His approach considers cash flow, leverage, management, ownership alignment, competitive position, industry dynamics, collateral, loan structure, and the borrower’s ability to perform under more challenging conditions.
What is Len’s experience with Business Development Companies?
Len was an early participant in the growth of the BDC market, founding and leading Fifth Street investment vehicles that provided capital to small and middle-market companies. His experience includes investing, capital formation, portfolio management, governance, valuation, reporting, and shareholder responsibilities.
How is Len involved in private credit today?
Len is the Founder of Tannenbaum Capital Group (TCG), an investment platform bringing together affiliated asset managers focused on private credit, opportunistic credit, and real estate lending. He contributes to TCG’s strategic direction while experienced executives lead its individual investment businesses.