Bechtel Corporation (Bechtel Group) is the largest construction and engineering company in the United States, ranking as the 5th-largest privately owned company in the U.S. Its headquarters are in the Financial District of San Francisco.
With an advanced biology degree, you can get a job as a biological research scientist. They conduct research, either independently or as part of a team, and they use the knowledge acquired from their research to develop medicine, diagnostic tools, and other products.
Because the jobs of a marine biologist are so wide-ranging, their salary is also. A person that has focused on marine biology in college may first get an entry-level technician job helping a researcher in a lab or in the field (or rather, out in the ocean).