Oasis Outsourcing

Mark Sinatra is President of the Western Region for Oasis Outsourcing, the largest privately-held HR Managed Services firm in the country.  Prior to his current role, Mark was CEO of Staff One HR from 2008 to 2018.  Mark led Staff One HR through a period of substantial growth highlighted by achieving the Dallas 100 twice and Inc. 5000 list four years in a row, and culminating in Staff One HR’s sale to Oasis Outsourcing in December 2017.  Before joining Staff One HR, Mark co-founded Gordian Capital, a private investment company that focuses on making long-term investments in lower middle market companies.

Mark is Chairperson of First3 Years, which is a non-profit focused on the healthy development of infants and toddlers, a Board Director with Social Venture Partners, and a member of Young Presidents’ Organization (YPO).  Mark is a MBA graduate of the Wharton School of Business, and holds a BA in Economics from Fordham University.  He holds the SHRM-CP Certification, is a Certified Predictive Index  analyst, and is a graduate of the Stagen Integral Leadership Academy.


Main Contact Info:

Maria Petroni

Professional Employer Consultant

Oasis Outsourcing

7675 Dagget St.

Suite 200

San Diego, CA 92111

Tel: 619-541-1849

Cell: 619-541-1849

Fax: 855-306-2025






Maria Petroni of Oasis

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