Leonard Joseph Hackenberg passed away on January 6, 2011 at his home at Windrows in Princeton, New Jersey. He was 84 years old.

The youngest of five children, he was born on March 6, 1926 in Wheeling, West Virginia to Frank and Katharine (Baumann) Hackenberg . After graduating from Wheeling Central Catholic High School, he enrolled at the University of Virginia and left to enlist in the U. S. Navy during WWII. Following his service in the Navy, he attended the University of Cincinnati where he met his future wife, Sally Halpert of New York City. They were married on October 4, 1947 and subsequently moved to New York City. He obtained a degree in Industrial Engineering from NYU in 1951.

"Hack" as he was known to everyone, was recruited by and spent his entire professional career with IBM. Following stints in Poughkeepsie and Binghamton, NY, Sally and Hack settled in Princeton NJ where they raised their family. As an engineer and planner with IBM he was responsible for scouting and establishing new plant sites including those in Dayton, NJ, Boulder, CO and San Jose, California among others. He retired from IBM in 1988 and did extensive traveling abroad.

He was known as an athlete and a fierce competitor whether it be playing poker, tennis, squash or golf with his friends at his beloved Springdale Golf Course.

Predeceased by his wife Sally of over 50 years in 1999, Hack is survived by his five daughters: Valerie Hackenberg of Easthampton MA, Marjy Ersbak , Marion Hughes of Orient, NY, Dr. Virginia Hackenberg of Leesburg VA and Ann Ross of Alexandria VA; and six grandchildren: Jamie Ersbak, Elizabeth Hughes, Jake Schisler, Kate Schisler, Michael Ross and Jack Ross.

A memorial mass will be held at St Paul's Catholic Church, 214 Nassau Street, Princeton, NJ on Saturday, January 15 at 11:00 AM.

In lieu of flowers, the family suggests donations may be made to the Princeton Public Library Foundation, Sands Library Building, 65 Witherspoon Street, Princeton, NJ 08542