Ruth Kleinmuller was a Manticoran citizen and an enlisted crewmember of the Royal Manticoran Navy.

In 1900 PD, ahe held the rank of Coxswain Third Class and was assigned to HMS Fearless as a pinnace pilot. Kleinmuller was assigned to Lieutenant Maxwell Stromboli's inspection team on Medusa, and piloted a pinnace in the Native Protection Agency attack on a drug lab in the Mossyback region. She also piloted the pinnace back to the drug lab with a team of investigators. (HH1)