Jenkin has worked at the company for 11 years, most recently as a director, and she was previously an underwriter at Euler Hermes.
At Aon, she will be responsible for delivering broking and technical support.
She said: "The pulp and paper sector has faced a tough two years with insurers cutting back on credit insurance cover while pushing up rates.
"We're working with the sector to deliver bespoke trade credit solutions for the sector, alongside credit management products that may complement, enhance or replace a traditional trade credit policy."
Jenkin replaces James Bowker, who has joined Credit Risk Solutions.