Leonard M. Tannenbaum

Tannenbaum was born to a Jewish family, the son of Adele Fuchsberg and Calvin M. Tannenbaum.[2][3] His father was a managing partner of Brecher, Fishman, Feit, Heller, Rubin, & Tannenbaum, a law firm in New York; his mother was a district administrator for the Nassau County Board of Cooperative Educational Services[3] and an exile from Cuba.[2][4] He graduated with a BS in economics and an MBA in finance as part of a submatriculation program from the Wharton School of the University of Pennsylvania.[1][5] He is a Chartered Financial Analyst holder.[5] After school he worked as an equity analyst for Merrill Lynch.[6]

In 1998, he founded Fifth Street Finance, a finance company specializing in raising funds from private investors and investing in small- and mid-sized companies. He raised $30 million[6] ($15 million from his father-in-law, Bruce E. Toll)[7] and established his first fund which made investments until 2004. In January 2005, he launched a second fund, Fifth Street Mezzanine Partners II which reached $157 million in value and included institutional investors such as DuPont, Sumitomo Bank and WP Global; the fund stopped investing in 2007. In 2007, he launched a third fund,[6] which in 2008, after taking the advice of David Einhorn, he converted into a business development company (BDC).[6] This entity, named Fifth Street Finance Corp., went public in May 2008.[6] Fifth Street's customers are primarily private equity firms that invest in lower middle-market or middle-market companies (averaging $10 million in EBITDA). Investments average $35 million and never exceed $100 million.[6] Effective September 2014, they received permission form the S.E.C. to increase the maximum investment across its platform to $250 million.[8] In 2017 Fifth Street Asset Management was sold to Oaktree Asset Management.

In 2020 he founded AFC GAMMA (AFC) out of his family office and in March 2021 took the mortgage REIT AFC Gamma public on the Nasdaq trading under the ticker AFCG. The company is an institutional-quality lender to commercial real estate with a specialty in cannabis and loans are secured by cash flows, licenses (in limited license states) and real estate.

Tannenbaum is a supporter of the Palm Beach Zoo, Jewish Federation of Palm Beach, Wharton University, Yo Soy Ella, PA CASA Court Appointed Special Advocates for Children, Corners Outreach and Chess in the Schools.[9]

Tannenbaum is also the chief executive officer of LMT Investments LLC and the president of the Leonard M. Tannenbaum Foundation.

In 1997, Tannenbaum married Elizabeth Toll, daughter of housing developer Bruce E. Toll, in a Jewish ceremony at the Ritz Carlton in Philadelphia.[3] They had three children Stephen, Max and Adam and divorced in October 2010.[7] After the divorce, Bruce E. Toll filed an unsuccessful lawsuit against Tannenbaum alleging that he had promised and failed to pay Elizabeth half the profits from the management of Fifth Street's latest fund.[10]

In 2013, he married Stacey Thorne and the couple divorced in 2016. (son, Justin)

Len married Robyn (Friedman) Tannenbaum in November 2019. They have two daughters Gemma and Ember.

He has six children (Stephen, Max, Adam, Justin, Gemma and Ember).

Max was the president of Dream Dragons, a company launched by 13 high school students through the Southwestern Connecticut chapter of Junior Achievement program, which empowers young entrepreneurs.[11]