Dave Clark, Amazon's senior vice president of worldwide operations.Dave Clark, Amazon’s senior vice president of worldwide operations.

Dave Clark, CEO of Amazon's worldwide consumer business and a top lieutenant of CEO Andy Jassy, will resign July 1 after 23 years at the company.

Clark's replacement was not named by Amazon. Amazon is in the process of figuring out a succession plan for Clark, and will announce an update over the next few weeks, according to Jassy.

Jassy said that the past few years have been among the most challenging and unpredictable in the history of Amazon's Consumer business.

Clark said he was leaving Amazon.

Clark told employees in an email that it was time for him to start a new journey. For some time, I have discussed my intent to transition out of Amazon and with my family and others close to me, but I wanted to make sure the teams were set up for success. I think it's time now.

One of the most important executives at Amazon is Clark. He took over the role after Jeff Wilke stepped down.

In 1999 Clark joined the company in its operations division. He is credited with scaling Amazon's fulfillment and logistics programs. He was nicknamed "The Sniper" because of his eye for identifying weaknesses in its operations.

A tight-knit group of over a dozen senior executives from almost all areas of Amazon's business is led by Clark.

Clark oversees a number of key units, including online stores, physical stores, the marketplace of third-party sellers, and the Amazon Prime subscription business, all of which generated more than 75% of Amazon's revenue in the quarter ended March 31.

The business has started to show some cracks in recent quarters, despite the huge growth of the retail unit during the coronaviruses epidemic. In April, Amazon said revenue increased in the first three months of the year.

Jassy said at the shareholder meeting last week that Amazon is focused on improving its consumer business. He said that Amazon is working to bring costs down and improve profitability.

Two days after she announced that she was leaving her role at Facebook, Clark left.

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