Claim: Gerri Lawlor was born 1969 and died in 2019, and was known for developing simlish.
Evidence: Gerri Lee Lawlor (1969 – January 28, 2019) was an American actress, voice actress and homeless advocate. She was the co-creator, along with Marc Gimbel and Stephen Kearin, of the fictitious Simlish language used in The Sims. 
1969 January 28, 2019 (aged 49–50) Developing Simlish