Yerzhanov was born on May 28, 1996, in Almaty, Kazakhstan. He has a sister. When Yerzhanov was 15 years old, he moved to the United States to train.[1] He works at a skating coach at Palm Beach Ice Works in West Palm Beach, where he also trains.[2]
Yerzhanov enjoys cooking and wants to enter the restaurant business after retiring from skating.[3] He also enjoys reading history books, particularly about Genghis Khan.[3] Yerzhanov plays ice hockey recreationally and was invited to join an amateur league in Florida, but declined due to injury concerns.[3]
During their first season together in 2018–19, Weatherby/Yerzhanov won the silver medal at the 2019 Kazakhstani Championships behind Gaukhar Nauryzova / Boyisangur Datiev and finished eighth at the Bavarian Open.
At Four Continents, Weatherby/Yerzhanov were 16th in the rhythm dance and 15th in the free dance to finish 16th overall. The World Championships were cancelled due to the COVID-19 pandemic.[9] During the ensuing lockdown, Weatherby/Yerzhanov trained separately for a time due to rinks being closed in Florida, before eventually meeting up to practice lifts off-ice.[1] To earn income, Yerzhanov worked as a personal trainer for a Russian family before it was deemed too high risk and went grocery shopping for the elderly.[3]
2020–2021 season
There were limited competition opportunities due to the pandemic. Weatherby/Yerzhanov plan to compete at the 2021 World Championships if they are not cancelled,[1] but were missing from the initial entry list.