Only about 80% of jobs are ever advertised, so we all rely on our personal networks in order to get that next job or promotion. Immigrants can arrive with all of the qualifications, credentials, and work experience, but unless they have an entry through an individual to their actual sector, oftentimes they find they cannot take advantage of it. One of the best things that happens in mentoring is that you build that professional network, and that's what gets you the job.
On March 10th, 2015. See this statement in context.