Adults with serious mental illness (SMI) are disproportionately affected by medical comorbidity, earlier onset of disease, and 10 to 25 years reduced life expectancy compared to the general population. These high rates of morbidity and early mortality are associated with inadequately managed medical and psychiatric illnesses. A recent systematic review found nine effective self-management interventions that address medical and psychiatric illnesses in adults with SMI. However, there has been limited adoption of these interventions due to both provider and consumer-based factors. Provider-based barriers consist of the lack of an adequate workforce with the capacity, time, and knowledge of effective approaches to self-management support for adults with SMI and chronic health conditions. Consumer-based barriers associated with limited participation in self-management programs include lack of access, engagement, and ongoing community-based support for persons with SMI. Peer support specialists have the potential to address these barriers as they comprise one of the fastest growing sectors of the mental health workforce, have "lived experience" in self-management practices, and offer access to support in the community. However, challenges need to be resolved for peers to be effective providers of evidence-based interventions. For example, peers are frequently trained to provide "peer support" described as "giving and receiving help founded on key principles of respect, shared responsibility, and mutual agreement of what is helpful". Peer support has been associated with increased sense of control, ability to make changes, and decreased psychiatric symptoms. Despite benefits, peer support does not adhere to evidence-based practices for psychiatric and medical self-management and does not follow protocols that ensure fidelity and systematically monitor outcomes. The investigators hypothesize that mobile technology has the potential to overcome these limitations of peer support by providing real-time guidance in fidelity adherent delivery of a peer-delivered, technology-assisted evidence-based self-management intervention (PDTA-IIMR). The investigator will build the necessary expertise to pursue a career developing and testing novel approaches to peer-delivered evidence-based self-management interventions. Training will include: development of peer-delivered interventions; development and design of mobile health-supported interventions; and intervention clinical trials research. Concurrently, this study includes refinement of the intervention protocol with input from peers and consumers and conducting a pilot study evaluating the feasibility and potential effectiveness of PDTA-IIMR compared to routine peer support for N=6 peers and N=40 adults with SMI and chronic health conditions. Outcomes include feasibility, medical and psychiatric self-management skills, functional ability, and mortality risk factors and examine self-efficacy and social support as mechanisms on outcomes.

Consumer Inclusion Criteria

Consumer eligibility includes the following:

• (1) participants will be adults age 18 or older who have a chart DSM-V Axis I diagnosis of schizophrenia, schizoaffective disorder, bipolar disorder, persistent major depressive disorder (diagnosis will be verified using the Mini-International Neuropsychiatric Interview);
• (2) have been enrolled in treatment for at least 3 months;
• (3) a chart diagnosis of a medical diagnosis of cardiovascular disease, obesity, diabetes, or chronic obstructive pulmonary disease;
• (4) speak and read English; and
• (5) voluntary informed consent for participation in the study by the participant.

Consumer Exclusion Criteria

Consumer participants will be excluded based on the following criteria:

• (1) chart diagnosis of dementia or documented cognitive impairment as indicated by the Mini Mental State Examination score <24;
• (2) major visual, hearing, or motor impairment (measured by potential participants' ability to use a smartphone);
• (3) currently residing in a nursing home;
• (4) terminal illness expected to result of death of participant within one year; or
• (5) consumers with two or more emergency room or hospitalizations in the last 6 months or as determined by the clinical team to be psychiatrically or medically unstable;

Peer Inclusion Criteria

Peer eligibility includes the following:

• (1) Massachusetts certified peer specialist (i.e., to qualify to be a Massachusetts certified peer specialist a person must self-report any mental health diagnosis, be in active treatment, and complete an 80 hour training that includes classes, small group activities, and homework on fundamentals of peer support, cross-cultural partnering, and human experience language. All certified peer specialists must pass a written examination);
• (2) a clinical history of improved psychiatric and medical self-management in the past 6 months;
• (3) speak and read English;
• (4) willing to use technology to deliver an intervention;
• (5) must provide voluntary informed consent for participation in the study; and
• (6) have worked as a certified peer specialist with people with SMI for 1+ years.

Peer Exclusion Criteria

Peer participants will be excluded based on the following criteria:

• (1) chart diagnosis of dementia or documented cognitive impairment as indicated by the Mini Mental State Examination score <24;
• (2) major visual, hearing, or motor impairment (measured by potential participants' ability to use a tablet); and
• (3) certified peer specialists with two or more emergency room or hospitalizations in the last 6 months or as determined by the clinical team to be psychiatrically or medically unstable.

Tools (data, assays, libraries, research tools, reagents, model organisms, etc.) will be made available, in accordance with the NIH Data Sharing Policy (http://grants.nih.gov/grants/policy/data\_sharing) and Model Organism Sharing Policy (http://grants.nih.gov/grants/policy/model\_organism/index.htm), to all researchers in both the private and public sector free or for a nominal charge and with minimal restriction. In some cases the Trustees of Dartmouth College (the institution) may determine that the public and the research community are better served by a licensing program whether or not patents have been filed. This may be relevant, for example, if a tool is best distributed under license to guarantee reagent availability and quality.