Hertha Marks married William Edward Ayrton, her former teacher at Finsbury Technical College, who was a widower with a young daughter. They shared a strong intellectual partnership and a commitment to social justice.

Hertha and William Ayrton's daughter, Barbara Ayrton, was born. Barbara later became a Labour politician and a prominent figure in the women's suffrage movement.

Ayrton was a passionate advocate for women's suffrage and participated actively in the movement. She supported various suffrage organizations and spoke publicly on the issue.

Ayrton developed a close friendship with Marie Curie, the pioneering physicist and chemist. They supported each other's scientific endeavors and shared a commitment to advancing women in science.

After the tragic death of Pierre Curie, Hertha Ayrton provided emotional support and practical assistance to Marie Curie, demonstrating the strength of their friendship.

William Ayrton died, leaving Hertha widowed. She continued her scientific work and activism, honoring his memory.

Ayrton consistently supported her family, particularly her siblings, financially and emotionally throughout her life. She was a strong and dependable figure for them.