Dashevsky was an accountant and management consultant before starting his own business. He retired in 1981 to devote his life to Israel, Zionism and the welfare of the Jewish people.
Dashevsky first went to Israel in 1955 when he was engaged by the accounting firm Kesselman & Kesselman for a special management consulting assignment and system installations. He lived in Israel for five months as part of that assignment and later visited the country more than 30 times.
Most of Dashevsky’s pro-Israel advocacy activities took place under the auspices of the ZOA. He served as a member of the national ZOA and Greater Philadelphia ZOA boards of directors and was the president of ZOA’s Mid-Atlantic Region for more than 20 years. Over the years, he also served on ZOA’s National Executive Committee and its National Administrative Board.
Greater Philadelphia ZOA presented him with its Meritorious Service Medal in 2012.
He was a past president of the Philadelphia branch of the American Zionist Movement.
Dashevsky founded a group known as ACT FAST (Action Committee To Fight Anti-Semitism Today) that was active in the 1970s and '80s, and was instrumental in the formation of the internationalization of the Jordan is Palestine Committee. He was its Mid-Atlantic chairman.
He served as a member of the board of the Jewish Community Relations Council of Greater Philadelphia and served on the National and Overseas Allocation Committee of the forerunner of what today is the Jewish Federation of Greater Philadelphia. He was active with the Wallenberg Committee and the Coordinating Committee on Vital Jewish Issues.
Dashevsky was a graduate of Temple University. During World War II, he worked in the inspection division of the naval aircraft factory at the Philadelphia Naval Shipyard and was retained as an instructor at their aviation inspection school. In 1944, he attended the Army finance school at Fort Harrison in Indiana.
Dashevsky also copyrighted 21 original songs between 1944 and 1945. In 1947, he wrote a musical with 27 songs called Things Was Made That Way (in the Key of Black) that he copyrighted. He played guitar and studied at the Barnes Foundation. An avid coin collector and stamp collector, he received the 50-year medal from the American Numismatic Society.
He was a longtime member of the Congregations of Shaare Shamayim.
Dashevsky was preceded in death by his wife, the former Gloria Alexenberg. He is survived by his daughter, Jodi Dashe (Gad Ifrah); a grandson, Jacob Ifrah; and many nieces and nephews and great-nieces and nephews.