The evolutionary genetics of adaptive divergence in experimental populations of Pseudomonas fluorescens; in particular, the genotypic and phenotypic bases of 'fuzzy spreader' fitness.
The evolution of bet-hedging strategies in microbial populations; in particular, bistable (epigenetic, stochastic) switching between phenotypes in Pseudomonas fluorescens and how evolution may "tune" phenotypic switch rate to that of the environment.