Who is Mr. JLB Matekoni from The Kalahari Typing School for Men and what is their importance?

Mr. JLB Matekoni is is engaged to Mma Ramotswe. He owns the Tlokweng Road Speedy Motor, where he is a mechanic, and he employs two apprentices. Mr. Matekoni recently suffered a debilitating depressive illness that left him unable to work, and while he was away, Mma Makutsi took care of his business. She even learned how to do minor repairs on the vehicles. When Mr. Matekoni returns to full health and to his business, he is also co-parenting the foster children Mma Ramotswe has taken in.