Who wrote the influential epistolary novels Pamela and Clarissa?

The correct answer is Samuel Richardson, who is known for pioneering the epistolary novel format in the 18th century. His works, "Pamela" and "Clarissa," are significant because they employ the use of letters as a narrative device, which allows for an intimate portrayal of characters' thoughts and emotions.

In "Pamela," the story unfolds through letters written by the protagonist, Pamela Andrews, illustrating her experiences and moral dilemmas as she resists the advances of her wealthy employer. Similarly, "Clarissa" uses letters to convey the complexities of its titular character's life, her struggles, and ultimately tragic fate. Richardson's innovations in character development and narrative style have profoundly influenced the novel as a genre, setting a precedent for future writers.