While at the Justice Department (Appellate Section, Environment and Natural Resources Division), Proto litigated cases concerning public lands, environment, and Native Americans. He received the Department's Special Commendation Award for Outstanding Service and the Division's Award for Meritorious Service. In 1979, Proto returned to New Haven. In January 1980, he served as co-chair of the first mayoral inauguration held at Yale University. The inauguration, held in
Woolsey Hall, included the president of Yale,
A. Bartlett Giamatti, and Connecticut governor
Ella T. Grasso. Proto wrote about the event in his book about Giamatti,
Fearless: A. Bartlett Giamatti and the Battle for Fairness in America. He has also written articles and a podcast about Giamatti's decision as commissioner of
Major League Baseball to banish
Pete Rose. Proto was elected to the board of directors of the
Long Wharf Theater, and served on the board of directors of the
Shubert Theatre (New Haven). In 1981, Proto received the Distinguished Alumnus Award from
Southern Connecticut State University. He had given the Commencement Address in 1976. In 1981, Proto returned to Washington, D.C., where he served as general counsel to President
Jimmy Carter's Nuclear Safety Oversight Committee (NSOC). Proto also has written about the corporate and government failure to ensure nuclear safety. From 1983 to 1989, Proto entered private practice in New Haven. He represented the city and state in various constitutional and environmental litigation in Washington, D.C.; Connecticut; and New York. Proto was appointed a visiting lecturer at
Yale College in 1988 and 1989, where he taught the history and law of nuclear power. Proto returned to Washington, D.C., to join Verner Liipfert Bernhard McPherson & Hand and begin teaching at
Georgetown University's Public Policy Institute (now the
McCourt School of Public Policy). He represented,
pro bono, the
National Trust for Historic Preservation and Protect Historic America (involving such authors as
David McCullough,
James Alan McPherson, and Pulitzer Prize-winning journalist
Nick Kotz) in their successful effort to stop
Disney from building a theme park in Virginia. He drafted a unique statutory scheme at the behest of the State of Hawaii that resulted in the conveyance of
Kaho'olawe Island from the United States to Hawaii for the special use of Native Hawaiians. His work led, in part, to the publication of his second book, ''The Rights of My People: Liliuokalani's Enduring Battle with the United States, 1898 to 1917.
The book explored the skilled and courageous efforts of former queen Liliuokalani on the continental United States to regain one million acres of land taken in the 1898 annexation by the United States. Proto also focused on the disquieting role played by lawyers. In December 2013, he donated the Rights of My People'' papers to the
University of Hawaii Law School. In 2002, Proto became a partner at
Schnader Harrison Segal & Lewis. In 2004, he was elected to the board of directors of the
Roosevelt Institute for a three-year term. In the summer of 2004, he served as counsel to Congresswoman
Rosa DeLauro (D-Conn.) in her capacity as chair of the Democratic Party Platform Drafting Committee. He served as chair (1995–2010) of the American Friends of
Wilton Park, a British-American educational organization with origins in World War II. In 2010, he served as a senior adviser to the
United States Naval Academy's Foreign Affairs Conference on "National Security Beyond the Horizon: Changing Threats in a Changing World." Later that year, he was elected a Fellow in the
Royal Geographical Society. == Selected writings ==