Alexander Onishchenko was born on March 31, 1969 in the district center Matveev-Kurgan, Rostov region, in the family of a serviceman.
In 1990, he successfully completed his studies at the Kharkov Military School of Home Front and received the qualification of an officer with a higher military specialty with advanced knowledge of German.
From 1990 to 1997 he was engaged in business activities in the field of fuel and energy.
At the same time with entrepreneurial activity from 1992 to 1997 he was engaged in public activities as Deputy Chairman of the Board of the Dneprovsky district branch of the Union of Afghanistan Veterans of Kiev.
In 1998 he became professionally interested in equestrian sport. The same year Alexander was elected vice-president of the All-Ukrainian public organization "Equestrian Federation of Ukraine".
Since 1999 he started to train actively and took part in competitions of national and international level.
Since 2000 he becomes a factory owner of the equestrian in Belgium, and the same year he introduces a program of training reserve athletes of the national team abroad, providing them with financial support for training with the best specialists in Europe.
Already in 2008, having formed the composition of the National Team and purchased the best horses, he personally competes for Ukraine at the Olympic Games in 2008 in China in the discipline of show jumping. According to the results of the performance, the Ukrainian National Team for the first time in its history took an unprecedented 12th place, which can undoubtedly be considered a sporting achievement of the national level.
In 2002 he was unanimously elected President of the Equestrian Federation of Ukraine, which he still holds today
In 2007 he was accepted to the civil service as Assistant Minister of the Department of the Minister's Activity Support of the Ministry of Ukraine for Emergency Situations and Population Protection from the Consequences of the Chernobyl Disaster.
In 2008, he received an education at the National Transport University, specializing in business economics.
Since October 31, 2010 and up to now he has been a deputy of the Kyiv Regional Council from the Party of Regions
He speaks 5 languages.