In a statement, Nordex said Zeschky has informed the non-executive board he intended to leave for "personal reasons". He will be replaced by chief customer officer Lars Krogsgaard.
Nordex added the company would also be led by Bernard Schäferbarthold, who will continue his role as chief financial officer.
Zeschky's departure follows a strong period of growth for Nordex. In May, it announced a Q1 net profit of 62% year-on-year to €14.8 million.
Prior to joining Nordex in 2011, Zeschky was the head of the industrial division of Voith Turbo, which specialises in mechanical, hydrodynamic, electric and electronic propulsion, as well as braking systems.
Zeschky replaced Thomas Richterich, who is currently head of onshore wind at Siemens.
Zeschky's appointment came at a difficult time for Nordex. The company had said it was lowering its sales target for 2011 from €1 billion to €920 million. The Q4 fall of €80 million cut Nordex's operating earnings by €20 million.
One of Zeschky's first moves was to abandon the company's N150 6MW offshore turbine, which was set to go to prototype.
Instead he focused on the low-wind sector and the N117 turbine, which is where the company has arguably had its greatest success.
In 2014's Windpower Monthly Top 30 People in the Wind Industry, Zeschky featured in sixth place.