There is a conventional thought that the Pop Art movement existed from the mid 1950's until the late 1970's, but for Brennan, the movement never ended. The idea that the utilitarian objects surrounding us can be seen as beautiful art is what drives him. He sees potential in creating art by combining unrelated objects and united them with color and spatial harmony thereby bringing more meaning than simply the means of necessity and convenience.
Brennan's process begins with either stretched canvas or plywood panel which may support a collage of vintage literature and technical drawings building the background with color and geometric suggestion. Over that, images are built up with pencil, charcoal, ink, acrylic and oil. These are the images of objects that challenge the existing notions of the objects that attend our daily existence. Large scale works extend to seven feet by nine feet.
Brennan was awarded "Best in Show" at the Old Fourth Ward Arts Festival, in Atlanta in 2016, and at the Big Four Show, in Louisville in 2017. In 2018 he was the featured artist at the Fine Art for Ocala Festival.