A millionaire investment banker was filmed punching a woman in the face, causing her to fall to the ground, on the streets of New York on Saturday evening.

Jonathan Kaye, 52, was seen throwing a vicious overhand right at the unnamed woman in Brooklyn - where he lives in a $4million four-bedroom townhouse in pricey Park Slope. It is unclear what sparked the confrontation.

Kaye works as a Managing Director at Moelis & Company, a leading investment bank with offices in Midtown Manhattan.

In the clip, the woman is seen being thrown to the floor by the force of the punch, as one onlooker unsuccessfully rushes to her aid. Others looking on are heard calling Kaye an 'a**hole' and telling him to 'go f**k himself' - earning his attention briefly before he abruptly walks away.

'We have become aware that one of our employees was involved in a serious incident in Brooklyn on June 8,' a Moelis representative said, as the 12-second snippet continues to gain traction online.

'We take this matter very seriously and are conducting an investigation,' she added.

According to a profile on Moelis's website, Kaye holds a B.A. from Tufts University, and graduated cum laude from the Duke University School of Law.

Another profile detailing Kaye's accomplishments, on The Jewish Grad Organization, touts his ten years at the firm, during which he helped Moelis 'become a market leader with over 125 executed transactions representing over $100 billion in collective enterprise value.'

Before that, he worked as Marketing director of CitiGroup - the third-largest banking institution in the US.

In his current role, he oversees 10 verticals within Moelis's Business Services faction, managing 'a dedicated team of bankers and... an extensive network of relationships with both strategic companies and private equity investors,' the bio states.

It adds how he also serves on the firm’s Management Committee, demonstrating his status in the financial sector.\