He is a retired sales executive from the technology sector and Silicon Valley. He served in numerous sales and management capacities during a 16-year tenure with IBM in the 1970s and 1980s. As principal sales executive, Mr. Shackleton helped launch Foundry Networks in 1997, a networking products startup that became one of the world's leading high-performance networking companies (since acquired by Brocade Networks).

Mr. Shackleton remains active with the Northern California Council of the Girl Scouts of America (where he served on and chaired the Board for several years) and supports various public education initiatives. Mr. Shackleton extends his passion for the search for a cure for Parkinson's beyond his work with MJFF's Board of Directors. He is an active participant in clinical research, serving as a control volunteer in several trials including the Parkinson's Progression Markers Initiative, MJFF's landmark biomarker study. Sharing his dedication, Mr. Shackleton's four adult children have been active with Team Fox, including running marathons and also serving as Team Fox Young Professionals in San Francisco and New York City, all in support of their late grandfather who lived with PD.

Mr. Shackleton graduated Phi Beta Kappa from the University of Colorado in 1973 with a degree in political science. He attended the Stanford Business School Executive Education Program in 1992.