The phrase "a core team member" is correct and usable in written English.
You can use it to refer to an essential or key member of a team who plays a significant role in its operations or projects.
Example: "As a core team member, Sarah was instrumental in driving the project to success."
Alternatives: "a key team member" or "an essential team member".
She co-chairs the South Asia Engagement Group leading the South Asia Conference at HKS, a core team member working on the upcoming Human Rights Symposium, and the India Conference.
This team leader took the young Dr. Zhou on and relied on him as a core team member until he left the factory to attend university.
Mobile entrepreneur Jennifer Lum is co-founder of Adelphic Mobile, was a core team member of Quattro Wireless (acquired by Apple) and m-Qube (acquired by VeriSign) and is an angel investor in mobile startups including Crashlytics, OnSwipe and Kinvey.
Francois is a core team member of Black Lives Matter: Atlantic City.
Less than 2%% of the visits involved other trained personnel substituting for a core team member.
Teams were most likely to achieve 'very good' ratings for: administrative preparation (a comprehensive agenda), membership/attendance (all core team members or deputies present for whole meeting), and tension/conflict (no tension or conflict in meetings) (Table 2, Figure 2).
We conducted a pre-post course evaluation involving all core team members from the 75 teams attending one of the 11 courses in the final year of the programme (September 2005 to October 2006).
After collecting baseline data, all core team members from each practice attended a one-day face-to-face learning session held on October 18 , 2013
The company was founded by members of the jQuery development team, and is lead by co-founder and CEO Mike Hostetler, who is both a jQuery core team member and previously a freelance developer/consultant. John Resig is not involved or affiliated with the company, and is employed by Mozilla as a developer.
Bakaus is a jQuery core team member, and helped create the user interface framework jQuery UI.
After founding Strobe, Jolley quickly teamed up with two Ruby on Rails core team members, Yehuda Katz (also a jQuery core team member) and Carl Lerche to get the project rolling.
