María Isabel Aillón was born in Ambato, Ecuador in 1985. She obtained her law degree from Pontificia Universidad Catolica del Ecuador in 2010.
In 2011–2013, she worked as an assistant professor of contracts, damages and obligations at Pontificia Universidad Catolica del Ecuador.
In 2013, she obtained a specialisation diploma in constitutional law from Universidad Andina Simon Bolivar, and in 2015, an LLM from the University of California, Berkeley, including a diploma in corporate law.
In her legal practice, she has worked as an associate lawyer at Pérez Bustamante & Ponce since 2010. In 2019, María Isabel started working to create the local chapter of the Women in Mining Organisation and by the end of that year she was appointed as the first president of the organisation in Ecuador. In 2020, she became the first director of the mining department of the firm.
She is a member of the Quito Bar Association, International Women in Mining and WIM LATAM, and the Board of Directors of Expominas Ecuador.
Her main areas of legal practice are mining, civil litigation, commercial and foreign investment law.