Nir Tessler (Hebrew: ניר טסלר; born: 1962) is the Barbara and Norman Seiden professor in the Faculty of Electrical and Computer Engineering and head of the Microelectronics and Nanoelectronics centers at the Technion - Israel Institute of Technology.

Tessler authored the thesis Dynamic Properties of Inverted QW Laser Structure, under the supervision of Gadi Eisenstein.

[3] Tessler was a research associate and later an EPSRC advanced fellow at the Cavendish Laboratory, Cambridge University, UK from 1995 to 1999.

[1] In 1996 Tessler was the first to introduce a “plastic laser” based on semiconducting organic molecule (polymer).

[8] In 2002 he showed that organic LEDs (OLEDs) can be made to emit light at a wavelength (“color”) that is relevant to fiber-based communication (i.e., at 1.3 micron).