David was born in New York City on August 4, 1941, the son of Philip Feigenbaum andMadeline Goodfriend. He graduated from Cornell University with a degree in mechanicalengineering. He received an M.S. and Ph.D. in oceanography from the University of Miami. In1963, he was married to Lynn Friedhoff. They had a son, John, and a daughter.

He was a high school teacher prior to 1980. Then he was on the faculty at Old DominionUniversity in Norfolk, Virginia, after 1980.

Feignbaum established David Lawrence Rare Coins (DLRC) in 1979 with a specialty in Barbercoinage. In 1989 he was one of the co-founders of the Barber Coin Collectors Society.

He died of ALS on May 25, 2002.

David Lawrence Rare Coins was established by David Feigenbaum in 1979. Initially he worked atit part time while teaching at Old Dominion.

John Feigenbaum became president and owner of David Lawrence Rare Coins in 1991. In 2015,Feigenbaum sold DLRC to John Brush and Dell Loy Hansen.

DLRC Press began book publication in 1989 with series.