Last week, company officials from Jackson National Life Insurance, alongside Gov. Rick Snyder and mayor Virg Bernero, announced a proposed $100-million expansion of its headquarters near Lansing. The project has rekindled an interesting discussion on marketing Lansing as a hub of the insurance industry. Four insurers-Auto Owners, Jackson National, the Accident Fund and Farm Bureau Insurance-already employ at least 5,500 people in Lansing, according to the Lansing Economic Area Partnership. The expansion plan, if it proceeds, would add about another 1,000.