He studied in Pardes Hanna Agricultural High School. From 1962 to 1968 he studied film and television in University of California, Los Los Angeles
He served in the parachuted Nahal unit of the Israel Defense Forces. He directed several documentaries, and produced and edited several television programs (including "Lo HaKol Over" and "Nikui Rosh"). He also directed satirical theater productions, including sketches for HaGashash HaHiver. He wrote and directed approximately 120 reports for the "Yoman" ("Diary") television program
From 1976 to 1979 he managed Channel One"s program division.
In the late 1980s he quit his permanent work in the Israel Broadcasting Authority (International Business Alliance) and established a video producing company, Anat, which produced industrial promotion films, mostly for ISCAR Metalworking. He continued to make reports for Yoman and also wrote a weekly column for Yediot Aharonot.
In 1993 he was appointed Chief Executive Officer of the International Business Alliance, a position he held until his retirement in 1998. In 2003, he began co-hosting the current affairs program "London & Kirschenbaum" with Yaron London on Channel Ten.
In 2008, they both signed for two more years.
Kirschenbaum died on September 25, 2015, one day after his 76th birthday. He was a widower, and had four children. He lived in Mikhmoret until his death.
He was a staff member of the Israeli television from its first day in May 1968, and was editor of "Mabat", its news program, during its first three years.