There are plenty of images of his work on the internet, but little in the way of biographical information. His web site is here, and from there you can link to "vita" for a few details. Heyder says he is self-taught and early-on was inspired by Salvador Dalí and Surrealism as well as Magical Realism.
I find his art more difficult to pigeonhole. Like Dalí, Heyder paints in a smooth, hard-edge style. But his subjects are seldom distorted in a Dalíesque manner. Nor is there any claim that he is tapping into his Freudian subconscious, as the actual Surrealists claimed (largely falsely, I think).
What Heyder does do is juxtapose items in wide-open settings that evoke the spatial feeling of Dalí and some other Surrealists. He also usually includes gorgeous, nude or partly-clad women in psychologically ambiguous situations.
It takes a lot of work to create paintings like Heyder's. Yet he has created a large number of them, so he's clearly a hard worker. Click on the images below to enlarge.
His website states: "In terms of technique, I generally work on canvas prepared with at least two coats of gesso. I do a pencil sketch on paper, then on the canvas before painting with acrylic and then in oil." But this photo shows him painting directly in what seems to be oil in a top-down "window shade" manner. To do this, he would have to have spent time clearly defining his images and carefully establishing colors and their placement before staring the final painting.
Juxtapositions with a Surrealist feeling.
More of the same, but with a whiff of Magical Realist Giorgio de Chirico.
Note the expression on the face of the woman at the left; this enlivens what otherwise would have been a static scene.
This is about as Surrealistic as Heyder gets.
The title is the same as that of an Ernest Hemingway novella, though its subject was entirely different from what Heyder shows here.
Something to do with her -- or the African falls?