Mark is responsible for evaluating and developing strategic initiatives for the Company. In addition, he is particularly active in development activities and reviewing detailed annual operating plans of the Company and the respective properties.

In 1965, Mark joined Builders Development and Service Company of Philadelphia. While employed there, he managed in excess of 1,500 apartment units in Pennsylvania and Delaware and developed over 700 new units along with two branch banks, a convenience food market, a 33,200 square foot supermarket and the first phase (200,000 square feet) of an enclosed regional mall shopping center. During this period, he also planned, zoned, developed and sold several hundred acres of land as tracts for single family housing.

In June 1969, Mark formed The Rubenstein Company. The Rubenstein Company assumed the responsibility for the completion and future management of all the projects at his former employer that were still in the developmental stages at the time Mark left Builders Development and Service Company. The basic construction and bookkeeping staff of the former company joined The Rubenstein Company.

In a measured program, over the last thirty years, the Company has developed into a full service real estate company with capacity for acquisition, development, construction, leasing, management and financing of substantial real estate projects. The Company also provides a full line of consulting services to major financial institutions covering both feasibility analysis of new projects, as well as workout services for under-performing properties.

Mark received a Bachelor of Science degree in Mechanical Engineering from Johns Hopkins University in 1962. From 1962 to 1965, he studied and taught Theoretical Mechanics in the Graduate School at Johns Hopkins University, graduating with a Masters degree in Engineering. Mark acted as a consultant to government and industry during this period, with a strong emphasis on construction problems. He is currently a trustee at Johns Hopkins University.