A proper noun indicating a place does not need 里 in a sentence with 在. Other nouns indicating a place may or may not need 里 in such a sentence, depending on whether the place has a well-defined boundary or not. (Normally 里 is used when there is a clear boundary.)
Tā xiàn zài zài zhōng guó xué zhōng wén 。
He is studying Chinese in China now.
Wǒ nǚ ér zài běi jīng gōng zuò 。
My daughter works in Beijing.
Wǒ mā mā xiàn zài méi yǒu gōng zuò ，tā zài jiā (lǐ )gěi rén kàn hái zǐ 。
My mother does not have a job now. She babysits for people at home.
Mā mā zài chú fáng (lǐ )zuò fàn ，bà bà zài kè tīng (lǐ )kàn diàn shì ，dì dì zài fáng jiān (lǐ )xiě gōng kè 。
My mother is cooking in the kitchen; my father is watching TV in the living room; my
younger brother is doing homework in the bedroom.
Mā mā ：bà bà gēn dì dì huí jiā le ma ？
Mother: Have your father and younger brother come home?
Nǚ ér ：méi yǒu ，bà bà hái zài bàn gōng shì ，dì dì hái zài xué xiào ne ！
Daughter: No. Father is still at the offi ce, and younger brother is still at school.
 Yip, P. C., Rimmington, D., Xiaoming, Z., & Henson, R. (2009). Basic Chinese: a grammar and workbook. Taylor & Francis.