O’Toole directs consulting projects that involve developing and implementing sustainable designs for landscapes in urban and rural settings. He oversees three staff who have served as environmental designers on 90,000 acres, including the landscape of the George W. Bush Presidential Center in Dallas, and along 8 miles of riverbank near San Antonio. Clients have also included national parks in five states, corporations and residences.

O’Toole oversees research projects focused on sustainable approaches that benefit and incorporate native plants. For instance, he has received national and state training on prescribed fire operations, and manages prescribed fires conducted on Center acreage that have demonstrated how to reduce the presence of an aggressive, invasive grass. O’Toole also trains professionals on sustainable landscape approaches, and helped the City of Austin develop a management plan for removing invasive plants on city lands.

His previous positions included serving as a restoration technician for the Nature Conservancy. O’Toole received a bachelor’s degree in geography from The University of Texas at Austin, a master’s degree in range and wildlife management from Sul Ross State University, and a master’s in landscape architecture and urban design from Texas A&M University.