Dobson is the second developer to leave Bitcoin Core in the past two months.
Developer Samuel Dobson announced
 via a series of tweets on Thursday night that he is stepping down as a 
Bitcoin Core maintainer after three years as he “can no longer dedicate 
the time required, as I approach the end of my Ph.D.”
As a Bitcoin Core wallet maintainer, Dobson had direct access to the 
cryptocurrency's code on GitHub, with permissions to approve changes and
 make improvements to the Bitcoin software. He was also responsible for 
ensuring the security of the protocol.
When asked if there’s a 
chance that he will come back to BTC Core development one day, Dobson 
answered Cointelegraph that his Ph.D. is his primary focus at the 
moment. And even though he hasn’t decided what he will do upon 
graduation, he is not interested in the development of other 
cryptocurrencies.
Dobson stated that he is particularly grateful 
for the support of his “incredibly generous sponsor” John Pfeffer, 
without which he would not have been able to prioritize working on 
Bitcoin part-time.
He made an appeal to the Twitter community to 
consider financially supporting a developer due to the nature of open 
source projects. He also told Cointelegraph:
“Bitcoin
Core development has obviously grown immensely since its conception back
with Satoshi. As an open source project, it will always be in an
interesting and more difficult position funding-wise, but things like
Brink, Chaincode, Spiral, and direct developer sponsorship via GitHub
have helped a lot.”
Bitcoin has already lost two 
maintainers since October. With Dobson's departure, the number of 
developers with direct access to Bitcoin code has dropped to five, according to an updated list on the Bitcoin Forum.
source link :  https://cointelegraph.com/news/bitcoin-core-developer-samuel-dobson-decides-it-is-time-to-go