Management Team

Jeff Cosman has had a lifetime experience in the solid waste industry from local operations up to corporate accounting and finance. In the early years, Jeff Cosman began to learn the waste industry business from his father who at the time was a Regional Vice President at Browning Ferris Industries, Inc. ("BFI").  He holds a B.B.A. in Managerial Finance and Banking & Finance, as well as a Bachelors of Accountancy from the University of Mississippi.  He was drafted by the New York Mets and played professional baseball in the minor leagues from 1993-1996.  Jeff Cosman is the youngest son of Jim Cosman, Sr., former President & COO of Republic Services.

In early 1997, Jeff Cosman joined his father at Republic Services as a Controller for a local operation in Chesapeake, VA. Later that year, he joined his father at the Corporate office in Ft. Lauderdale to join a small corporate finance team which played an active role in the consolidation efforts as Republic Services acquired 168 companies in 30 months, going from $500MM in Revenue to over $2.1BN.

Leaving Republic after the company completed its spin-off from Republic Industries; Jeff Cosman spent 10 years in various leadership roles within the startup/emerging medical device industry.  In and out of the medical device industry in the early 2000's, Mr. Cosman began his trail of entrepreneurial endeavors starting with Market Street Capital, JC Waste Solutions, Legacy Waste Solutions and Dynamic Molecular Solutions. In 2012, he purchased a small telecom materials and parts distribution company in Japer, GA, which has now grown to supply customers all over the US.  In April 2015, Mr. Cosman and his wife Rachel bought their partners out of the business and wholly own the business as Rosewood Communication Supply.

In 2010, Jeff Cosman began formally working on creating mobile apps with the development of cConnects.  cConnects is a pioneering enterprise solution that enables internal organizations to connect with external customers and vendors based on established rules, guiding principals of saving time without spending time scheduling events and that can be delivered through app based installs without the hassle of large custom enterprise builds which are costly.

Jeff Cosman has long been inspired by his father's expertise in the waste industry. As a backdrop, prior to Jim Cosman, Sr. passing away in 2013, he spent years under his guidance and oversight in their daily travels at Republic Services and their individual consulting businesses.  Mr. Cosman Sr. focused on "Doing Things Better" daily.  He believed in bringing transformative technology to a simple business model like the garbage business.

Jeff Cosman owns the control-voting block (Preferred A) of MRDN as well as he is the majority common shareholder.

Walter “Wally” Hall, Jr. started his solid waste career with Browning Ferris Industries (“BFI”) in 1990 and learned the business as a true garbage man:  Supervisor, Operations Manager, Manager-Trainee, General Manager, Region Operations Manager and Regional Vice President.  Within his first 6 years at BFI, he oversaw 400 employees with annual revenue of $50 Million.  After transitioning to Republic Services in a General Manager position, he was asked to assume the role of RVP for the Southland Waste division of Republic Services.  In 2001, Mr. Hall was one of three founders of Advanced Disposal Services, Inc., which is now the fourth largest solid waste company in the U.S.  Starting with three trucks, Mr. Hall grew Advanced Disposal’s operations to over $1.3 Billion in annual revenue, 5300 employees, 91 collection/hauling facilities, 45 MSW and C&D Landfills, 71 Transfer Stations and 21 recycling facilities.  After completing the 2012 integration of the Advanced Disposal – Interstate Waste – Veolia Environmental acquisitions by the company, Mr. Hall left Advanced Disposal in 2014 to pursue other interests.  He is a graduate of Mississippi College and former College Baseball Coach at The University of Mississippi.

Mr. Diaz was most recently responsible for ensuring accurate and timely completion of the month-end, quarter-end, and year-end closing process for Advanced Disposal Services, Inc. (NYSE: ADSW), a $1.4 billion publicly-traded company while managing accounting policies, procedures and internal control within a SOX-compliant environment. His experience also includes performing due diligence and subsequent purchase accounting for numerous acquisitions. He has also held financial reporting and auditing positions with CSX Transportation and Skinner Nurseries, Inc. Mr. Diaz began his career as an auditor with the national accounting firm McGladrey & Pullen, LLP.

Diaz holds an MBA and bachelor's degree from the University of North Florida. He is a certified public accountant.