In 1957, he received his first solo exhibition at the Franz Bader Gallery attracting positive reviews that cited him as a promising young artist.

[4][6] That Corcoran show garnered positive reviews including one by Paul Richard, the longtime art critic at The Washington Post.

He sees an empty wheelbarrow bright in the back yard, glowing in the sunshine of a summer afternoon, and in a few strokes captures the essence of that vision.

Boul’s retrospective at the Corcoran delivers to the brain bracing little jolts of a strong emotion sensed seldom in contemporary art.

Stanford's director there, Adrienne Jamieson, wrote in the exhibition's catalogue: "Throughout his over six decades of making art in Washington and its environs, Jack Boul has captured the quotidian: the gently illuminated interior of a cafe or his own studio; the geometric shapes that compromise a cityscape; a pastoral scene anchored by beautifully painted cows.

"[4] In June 2022, the works of Jack Boul were exhibited in Paris at the Salle Paul Rosenberg, the legendary gallery of the art dealer of Picasso.

In addition, Boul's works have been added to the Library of Congress Prints and Photographs division and the Smithsonian Institution's National Museum of American History.

While serving in the US Army as a young soldier in Italy at the end of World War II, Boul has said he was profoundly affected by official government photos of the atrocities at Nazi concentration camps.

“Jack Boul’s series is more than simply about the Holocaust as a pictorial record,” wrote Dr. Eric Denker, Senior Lecturer at the National Gallery of Art in Washington.