Levitt was one of the first researchers to conduct molecular dynamics simulations of DNA and proteins and developed the first software for this purpose. He is currently well known for developing approaches to predict macromolecularstructures, having participated in many Critical Assessment of Techniques for Protein Structure Prediction competitions, where he criticised molecular dynamics for inability to refine protein structures. He has also worked on simplified representations of protein structure for analysing folding and packing, as well as developing scoring systems for large-scale sequence-structure comparisons. He has mentored many successful scientists, including Mark Gerstein and Ram Samudrala. Cyrus Chothia was one of his colleagues.
Industrial collaboration
Levitt has served on the Scientific Advisory Boards of the following companies: Dupont Merck Pharmaceuticals, AMGEN, Protein Design Labs, Affymetrix, Molecular Applications Group, 3D Pharmaceuticals, Algodign, Oplon Ltd, Cocrystal Discovery, InterX, and StemRad, Ltd,.
Covid-19
He has done non-peer reviewed research on Covid-19 In March, he successfully predicted when the rate of increase in the number of deaths in China would slow down. In a Stanford Daily interview during May, Levitt pointed to China, Italy and South Korea as countries that have experienced decreases in cases and deaths, and attributed the decreases to the countries reaching herd immunity at 30%, "You don’t actually have to infect everybody, depending on how fast the virus grows. Some people say 80% , some people say 60%. I personally think it’s less than 30%. And some people are saying we’re never going to get herd immunity. I don’t think so." However, this assertion is problematic, as Levitt's claim fails to account for the mitigation and containment policies taken by all three countries to reduce transmission and prevent deaths. Both China and Italy enacted large scale, and in some regions, draconian lockdowns to slow spread and suppress the number of cases low enough, to the point that test, trace and isolate practices could be enacted to contain it. Meanwhile South Korea moved quickly, early on in the pandemic and enacted an aggressive test, trace and isolate approach to contain the virus before lockdowns were needed. Such mitigation and containment policies were enacted for the specific reason of slowing the spread of the virus and to decrease deaths, therefore, Levitt's claim that case growth and daily deaths decreased as a result of reaching herd immunity is questionable. He predicted that there would be a slowdown in covid cases He accurately predicted the initial trajectory of the pandemic, and when China would peak. On the other hand, in March 2020 he made severely wrong predictions that Israel would suffer no more than 10 COVID-19 deaths, as well as that the USA will have a much faster coronavirus recovery than expected. He says that the lockdown saved no lives, and may have cost more lives. He said to Neil Ferguson that there was an overestimation in potential deaths.
Levitt holds American, British and Israeli citizenship. His wife Rina died on 23 January 2017. He is the sixth Israeli to be awarded the Nobel Prize in Chemistry in under a decade.