The chief scientist brought on to lead the Trump administration's vaccine efforts has spent the last several days trying to disentangle pieces of his stock portfolio and his intricate ties to big pharmaceutical interests. The scientist, Moncef Slaoui, is a venture capitalist and a former longtime executive at GlaxoSmithKline. Most recently, he sat on the board of Moderna, a Cambridge, Mass., biotechnology firm with a $30 billion valuation that is pursuing a coronavirus vaccine. He resigned when President Trump named him last Thursday to the new post as chief adviser for Operation Warp Speed, the federal drive for coronavirus vaccines and treatments. Just days into his job, the extent of Dr. Slaoui's financial interests in drug companies has begun to emerge: The value of his stock holdings in Moderna jumped nearly $2.4 million, to $12.4 million when the company released preliminary, partial data from an early phase of its candidate vaccine trial. Dr. Slaoui did not come on board as a government employee. Instead, he is on a contract ... that leaves him exempt from federal disclosure rules that would require him to list his outside positions, stock holdings and other potential conflicts. And the contract position is not subject to the same conflict-of-interest laws and regulations that executive branch employees must follow. Dr. Slaoui ... is not the first Trump administration official with close relationships to drug and health care companies. Alex M. Azar II, the health and human services secretary, is a former Eli Lilly executive.