Demetrios "Mimis" Tsintolas, 92, founder of a Washington real estate firm and a longtime leader of the Greek community, died Sept. 23 of a heart attack at Holy Cross Hospital. He lived in Silver Spring.

As president of Tsintolas Realty Co., which he founded in 1950, Mr. Tsintolas was active in construction, real estate development and building management across the Washington area for decades. But he may have been better known for his tireless advocacy of Greek culture, traditions and public causes on the local and national levels. For many years, he was host of a Washington area radio program about Greek culture and life.

In the 1950s, Mr. Tsintolas became active in the Pan Arcadian Federation of America, a fraternal philanthropic organization for people with family roots in the Arcadia region of Greece. He was elected president of the Washington chapter 10 times and served two years as its national president.

During his term as national president from 1959 to 1961, he launched a private mission to ship farm equipment to Greece. He organized a visit in 1960 to distribute clothing, food and medical supplies and also helped rally support among U.S. government leaders to send humanitarian materials as Greece was rebuilding after World War II and internal wars.

Mr. Tsintolas was born in Tripolis, Greece. He graduated from Panteion University in Athens and worked with the Agricultural Bank of Greece for 12 years. He also contributed articles on Greek social issues to newspapers. From 1939 to the end of World War II, he served in the intelligence service of the Greek army.

He immigrated to the United States in 1946 and attended the University of Maryland, receiving a master's degree in agricultural economics in 1950.

Mr. Tsintolas was a member of several Greek Orthodox parishes across the region: St. Sophia Cathedral in Washington; Saints Constantine and Helen in Washington; St. Theodore in Lanham; St. George in Bethesda; St. George's in Ocean City; and Dormition of the Virgin Mary in Winchester, Va. He served on the parish councils of several of these churches.

The Greek Orthodox Archdiocese of North and South America awarded him its highest honor, the Order of the Medal of St. Paul. He also received the Archdiocese Service Award for his contributions to the people of Cyprus.

In 1978, the Ecumenical Patriarchate of Constantinople gave him the title of archon for his long service to the Greek Orthodox Church. Mr. Tsintolas was honored four times with awards and medals from the Greek government.

In 1965, he launched "The Greek Family," a Greek-language radio program broadcast on Washington area radio stations for more than 35 years. Mr. Tsintolas and his son Efstratios were hosts of the program, which featured Greek music and discussions of cultural traditions.

He helped persuade the town of Arcadia, Calif., to become the sister city of his native region of Arcadia. He also helped establish the Silver Spring chapter of the American Hellenic Educational Progressive Association and served as its president for five years.

In 1999 and 2003, Mr. Tsintolas received awards at the national conventions of the Pan Arcadian Federation of America. In 2003, he received the Ellis Island Medal of Honor from the National Ethnic Coalition of Organizations Foundation.

Among his personal interests, Mr. Tsintolas enjoyed following soccer matches from around the world.

Survivors include his wife of 55 years, Helen Tsintolas of Silver Spring; two daughters, Fotini T. Economides and Cassandra T. Johnson, both of Bethesda; two sons, Efstratios D. Tsintolas of Rockville and Chris E. Tsintolas of Gaithersburg; a sister, Sophia Varveris of Silver Spring; and nine grandchildren.

Demetrios Tsintolas, 92, led a Washington

real estate firm.