text: While Einstein provided the groundwork, this physicst was the first to write E equals m c squared in his 1907 paper on the elementary electrical charge.  
full_question: While Einstein provided the groundwork, this physicst was the first to write E equals m c squared in his 1907 paper on the elementary electrical charge.  However, in 1922 he called Einstein and Sommerfeld a bad influence in his "The Present Crisis in German Physics" before joining with Lenard to lead the "Deutsche Physik" movement.  An effect known for this man allows fast switching in QCSE optical modulators.  Winning the 1919 Nobel prize for showing that an electric field splits the spectral lines of a dipole, for 10 points, name this German physicist who names the electric analog of the Zeeman effect.
first_sentence: While Einstein provided the groundwork, this physicst was the first to write E equals m c squared in his 1907 paper on the elementary electrical charge.  