Student or Learner
A graduate from Mumbai University with a Bachelor of Mass Media in Advertising. He has been in the field for 5 years. He brings a wealth of expertise based on strategic and creative development for clients. His role involves writing copy across all media, as well as providing proofing and editing services. Before joining NAC, he has worked for such clients as ICICI Bank, Maruti Suzuki, Standard Chartered Bank,
The final should be simple past: He worked, not he has worked.