Question: what german expressionist did early german cinema influence?
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Paul Wegener (11 December 1874 – 13 September 1948) was a German actor, writer and film director known for his pioneering role in German expressionist cinema. 
Many critics see a direct tie between cinema and architecture of the time, stating that the sets and scene artwork of Expressionist films often reveal buildings of sharp angles, great heights, and crowded environments, such as the frequently shown Tower of Babel in Fritz Lang’s "Metropolis".
Strong elements of monumentalism and modernism appear throughout the canon of German Expressionism.
An excellent example on this is "Metropolis", as evidenced by the enormous power plant and glimpses of the massive yet pristine 'upper' city.
Expressionist paintings avoided the use of subtle shadings and colors.
They often used large shapes of bright, unrealistic colors with dark,and they were often cartoon-like.
Buildings might sag or lean, showing the ground tilted up steeply.
German Expressionist films produced in the Weimar Republic immediately following the First World War not only encapsulate the sociopolitical contexts in which they were created, but also rework the intrinsically modern problems of self-reflexivity, spectacle and identity.
Robert Wiene's silent film "The Cabinet of Dr. Caligari" (1919) is universally recognized as an early classic of Expressionist cinema.
Following the esteemed critiques of Siegfried Kracauer and Lotte Eisner, these films are now viewed as a kind of collective consciousness, so inherently tied are they to their social milieu.
Briefly mentioned by J.P. Telotte in his analysis of German film, “German Expressionism: A Cinematic/ Cultural Problem”, expressionism focuses on the “power of spectacles” and offers audiences “a kind of metonymic image of their own situation”.
This film movement paralleled Expressionist painting and theater in rejecting realism.
The creators of the time sought to convey inner, subjective experience through external, objective means.
Their films were characterized by highly stylized sets and acting; they used a new visual style which embodied high contrast and simple editing.
The films were shot in studios where they could employ deliberately exaggerated and dramatic lighting and camera angles to emphasize some particular affect - fear, horror, pain.
Aspects of Expressionist techniques were later adapted by such directors as Alfred Hitchcock and Orson Welles and were incorporated into many American gangster and horror films.
Some of the major filmmakers of this time were F.W.
Murnau, Erich Pommer, and Fritz Lang.
The movement ended after the currency stabilized, making it cheaper to buy movies abroad.
The UFA financially collapsed and German studios began to deal with Italian studios which led to their influence in style of horror and films noir.
The American influence on the film industry would also leed some film makers to continue their career in the US. 
Erich Karl Heinrich Kettelhut (1 November 1893 – 13 March 1979) was a German production designer, art director and set decorator.
Kettelhut is considered as one of the most important artists in the history of early German cinema, mainly for his set direction for "Die Nibelungen" (1924) and his design and visual effects for "Metropolis" (1927).
His early career was defined by a working relationship with fellow designers Otto Hunte and Karl Vollbrecht, the trio working on many of Fritz Lang's early German films.
Despite being best known for his iconic visuals on several of the most important films of German Expressionist cinema, he is also noted for a career spanning into the 1960s and his work on more light-hearted films and musicals. 
Alexander Mohr (1892–1974) was a German Expressionist artist. 
German Expressionism refers to a number of related creative movements beginning in Germany before the First World War that reached a peak in Berlin, during the 1920s.
These developments in Germany were part of a larger Expressionist movement in north and central European culture in fields such as architecture, painting and cinema.
German Expressionist painting produced a great number of works, and led to Neo-expressionism.