Len Sekemoto is a Sim who lives with his wife Gretel and their son Kristofer in Lunar Lakes. He is said to be a famous astronomer, and the starry pattern of his T-shirt matches this.
As the Astronomer career doesn't exist in the game, he in fact working in the Science career at level 4, as a Fertilizer Analyst. He has 4 points in the Gardening and Logic skills, as well as 1 in Handiness. Len is friends with Anais Willheim and Stefan Bayless.