Question: What English physician was able to influence public health improvements?

Context paragraphs:
1854 Broad Street cholera outbreak: The Broad Street cholera outbreak (or Golden Square outbreak) was a severe outbreak of cholera that occurred in 1854 near Broad Street (now Broadwick Street) in the Soho district of London, England.  This outbreak, which killed 616 people, is best known for the physician John Snow's study of its causes and his hypothesis that contaminated water, not air, was the source of cholera.  This discovery came to influence public health and the construction of improved sanitation facilities beginning in the mid-19th century.  Later, the term "focus of infection" would be used to describe sites, such as the Broad Street pump, in which conditions are good for transmission of an infection.  John Snow's endeavor to find the cause of the transmission of cholera caused him to unknowingly create a double-blind experiment.

Abdul El-Sayed: Abdulrahman Mohamed El-Sayed (born October 31, 1984) is an American physician, epidemiologist, public health expert, and candidate for Governor of Michigan.  He has announced his candidacy for Governor of Michigan, running as a Democrat.  He served as the Executive Director of the Detroit Health Department and Health Officer for the City of Detroit from 2015-2017.  Appointed at 30 years old, he was the youngest health commissioner in a major US City.  Previously, he was Assistant Professor in the Department of Epidemiology at Columbia University.  He is an internationally recognized public health expert, and the author of over 100 scholarly articles, abstracts, and book chapters on public health policy, social epidemiology, and health disparities.  His essays on public health policy have also been published in "The New York Times", CNN, "The Hill", "The Huffington Post", "The Detroit News", and the "Detroit Free Press".  On February 9, 2017, the Detroit News reported that El-Sayed will resign his position as health director to run for governor of Michigan in the 2018 Democratic Party primary.

Professional degrees of public health: The Master of Public Health (M.P.H.), Master of Science in Public Health (MSPH), Master of Medical Science in Public Health (MMSPH) and the Doctor of Public Health (Dr.P.H.) , International Masters for Health Leadership] (IMHL)] are multi-disciplinary professional degrees awarded for studies in areas related to public health.  The MPH degree focuses on public health practice, as opposed to research or teaching.  Master of Public Health programs are available throughout the world in Programs in Public Health, Medical Schools, Schools of Public Health, and Schools of Public Affairs.

Soesterberg Principles: The Soesterberg Principles was adopted by the Trans-Atlantic Network for Clean Production on May 16, 1999.  It was a commitment that for new technical innovation in the industry, that innovation should also include improvements in the environment, health, and social issues that follow.  It is an electronic sustainability commitment that technical improvements should correspond to environmental and health improvements.  The Electronic Sustainability Commitment of the principles reads:

Joseph Walter Mountin: Joseph Walter Mountin MD (October 13, 1891 – April 26, 1952) was an American physician and career United States Public Health Service (USPHS) officer who was the founder of the U.S. Centers for Disease Control and Prevention in Atlanta, Georgia.  Mountin eventually became an assistant surgeon general.  He was involved in many advancements in medical and sanitary science during his lifetime.  He was an early advocate for a national health care system and wrote frequently on the need to provide broader health care coverage.  He was considered influential in the development of public health improvements.

Steven K. Galson: Steven Kenneth Galson (born 1956) is an American public health physician.  He is currently Senior Vice President for Global Regulatory Affairs at Amgen, the S. California-based innovative global biopharmaceutical company.  He is also Professor-at-Large at the Keck Graduate Institute for Applied Life Sciences in Clarmont, California.  He is a retired rear admiral in the United States Public Health Service Commissioned Corps and public health administrator who served as the acting Surgeon General of the United States from October 1, 2007 – October 1, 2009.  He served concurrently as acting Assistant Secretary for Health from January 22, 2009 to June 25, 2009, and as the Deputy Director and Director of the Center for Drug Evaluation and Research (CDER) at the Food and Drug Administration from 2001 to 2007.  As the Acting Surgeon General, he was the commander of the United States Public Health Service Commissioned Corps and, while serving as the Assistant Secretary for Health, was the operational head of the Public Health Service.

John Snow: John Snow (15 March 1813 – 16 June 1858) was an English physician and a leader in the adoption of anaesthesia and medical hygiene.  He is considered one of the fathers of modern epidemiology, in part because of his work in tracing the source of a cholera outbreak in Soho, London, in 1854.  His findings inspired fundamental changes in the water and waste systems of London, which led to similar changes in other cities, and a significant improvement in general public health around the world.

John Snow, Inc: John Snow, Inc. (JSI) is a public health research and consulting firm in the United States and around the world.  Named after the English physician John Snow, JSI, with its nonprofit partner JSI Research & Training Institute, Inc., provides technical and managerial assistance to public health programs worldwide.  JSI is affiliated with the Russia Institute for Family Health, JSI Brasil, Instituto Promundo, and World Education, Inc.

Council on Education for Public Health: The Council on Education for Public Health (CEPH) is an independent agency recognized by the U.S. Department of Education to accredit schools of public health and public health programs offered in settings other than schools of public health.  These schools and programs prepare students for entry into careers in public health.  The primary professional degree is the Master of Public Health (M.P.H.) but other master's and doctoral degrees are offered as well such as the Doctor of Public Health (DrPH).

Public Health Advisor: The Public Health Advisor, or “PHA” is a type of public health worker which was established in 1948 by the United States Public Health Service in the Venereal Disease Control Division.  Today they are hired primarily by the U.S. Centers for Disease Control and Prevention (CDC) and serve in many public health programs.  This type of worker is unique in public health, because they begin their service at the entry level of public health doing what is known as “field work” or “contact epidemiology” which refers to the interviewing and locating of people who have been exposed to an infectious disease so as to offer them treatment and to reduce the epidemic.  Following their initial work experiences, PHAs are exposed to a variety of public health programs across the United States, learning to function at all levels of the public health system.  During their time of service, PHAs are called upon to respond to public health or humanitarian crisis.  This article will briefly describe the history of the Public Health Advisor and will mention a few notable contributions made over the course of their history with the Public Health Service and later with the Centers for Disease Control and Prevention.

Supporting paragraphs: 1854 Broad Street cholera outbreak John Snow
Answer: John Snow